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/*
Unix SMB/CIFS implementation.
change notify handling - hash based implementation
Copyright (C) Jeremy Allison 1994-1998
Copyright (C) Andrew Tridgell 2000
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"
struct change_data {
time_t last_check_time; /* time we last checked this entry */
time_t modify_time; /* Info from the directory we're monitoring. */
time_t status_time; /* Info from the directory we're monitoring. */
time_t total_time; /* Total time of all directory entries - don't care if it wraps. */
unsigned int num_entries; /* Zero or the number of files in the directory. */
unsigned int mode_sum;
unsigned char name_hash[16];
};
/****************************************************************************
Create the hash we will use to determine if the contents changed.
*****************************************************************************/
static BOOL notify_hash(connection_struct *conn, char *path, uint32 flags,
struct change_data *data, struct change_data *old_data)
{
SMB_STRUCT_STAT st;
pstring full_name;
char *p;
const char *fname;
size_t remaining_len;
size_t fullname_len;
void *dp;
ZERO_STRUCTP(data);
if(SMB_VFS_STAT(conn,path, &st) == -1)
return False;
data->modify_time = st.st_mtime;
data->status_time = st.st_ctime;
if (old_data) {
/*
* Shortcut to avoid directory scan if the time
* has changed - we always must return true then.
*/
if (old_data->modify_time != data->modify_time ||
old_data->status_time != data->status_time ) {
return True;
}
}
/*
* If we are to watch for changes that are only stored
* in inodes of files, not in the directory inode, we must
* scan the directory and produce a unique identifier with
* which we can determine if anything changed. We use the
* modify and change times from all the files in the
* directory, added together (ignoring wrapping if it's
* larger than the max time_t value).
*/
dp = OpenDir(conn, path, True);
if (dp == NULL)
return False;
data->num_entries = 0;
pstrcpy(full_name, path);
pstrcat(full_name, "/");
fullname_len = strlen(full_name);
remaining_len = sizeof(full_name) - fullname_len - 1;
p = &full_name[fullname_len];
while ((fname = ReadDirName(dp))) {
if(strequal(fname, ".") || strequal(fname, ".."))
continue;
data->num_entries++;
safe_strcpy(p, fname, remaining_len);
ZERO_STRUCT(st);
/*
* Do the stat - but ignore errors.
*/
SMB_VFS_STAT(conn,full_name, &st);
/*
* Always sum the times.
*/
data->total_time += (st.st_mtime + st.st_ctime);
/*
* If requested hash the names.
*/
if (flags & (FILE_NOTIFY_CHANGE_DIR_NAME|FILE_NOTIFY_CHANGE_FILE_NAME|FILE_NOTIFY_CHANGE_FILE)) {
int i;
unsigned char tmp_hash[16];
mdfour(tmp_hash, (const unsigned char *)fname, strlen(fname));
for (i=0;i<16;i++)
data->name_hash[i] ^= tmp_hash[i];
}
/*
* If requested sum the mode_t's.
*/
if (flags & (FILE_NOTIFY_CHANGE_ATTRIBUTES|FILE_NOTIFY_CHANGE_SECURITY))
data->mode_sum += st.st_mode;
}
CloseDir(dp);
return True;
}
/****************************************************************************
Register a change notify request.
*****************************************************************************/
static void *hash_register_notify(connection_struct *conn, char *path, uint32 flags)
{
struct change_data data;
if (!notify_hash(conn, path, flags, &data, NULL))
return NULL;
data.last_check_time = time(NULL);
return (void *)memdup(&data, sizeof(data));
}
/****************************************************************************
Check if a change notify should be issued.
A time of zero means instantaneous check - don't modify the last check time.
*****************************************************************************/
static BOOL hash_check_notify(connection_struct *conn, uint16 vuid, char *path, uint32 flags, void *datap, time_t t)
{
struct change_data *data = (struct change_data *)datap;
struct change_data data2;
if (t && t < data->last_check_time + lp_change_notify_timeout())
return False;
if (!change_to_user(conn,vuid))
return True;
if (!set_current_service(conn,True)) {
change_to_root_user();
return True;
}
if (!notify_hash(conn, path, flags, &data2, data) ||
data2.modify_time != data->modify_time ||
data2.status_time != data->status_time ||
data2.total_time != data->total_time ||
data2.num_entries != data->num_entries ||
data2.mode_sum != data->mode_sum ||
memcmp(data2.name_hash, data->name_hash, sizeof(data2.name_hash))) {
change_to_root_user();
return True;
}
if (t)
data->last_check_time = t;
change_to_root_user();
return False;
}
/****************************************************************************
Remove a change notify data structure.
*****************************************************************************/
static void hash_remove_notify(void *datap)
{
free(datap);
}
/****************************************************************************
Setup hash based change notify.
****************************************************************************/
struct cnotify_fns *hash_notify_init(void)
{
static struct cnotify_fns cnotify;
cnotify.register_notify = hash_register_notify;
cnotify.check_notify = hash_check_notify;
cnotify.remove_notify = hash_remove_notify;
cnotify.select_time = lp_change_notify_timeout();
return &cnotify;
}
/*
change_notify_reply_packet(cnbp->request_buf,ERRSRV,ERRaccess);
change_notify_reply_packet(cnbp->request_buf,0,NT_STATUS_NOTIFY_ENUM_DIR);
chain_size = 0;
file_chain_reset();
uint16 vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID :
SVAL(cnbp->request_buf,smb_uid);
*/
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