3 Unix SMB/Netbios implementation.
6 Copyright (C) Andrew Tridgell 2000
7 Copyright (C) Jeremy Allison 1994-1998
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 extern int DEBUGLEVEL;
28 static struct cnotify_fns *cnotify;
30 /****************************************************************************
31 This is the structure to queue to implement NT change
32 notify. It consists of smb_size bytes stored from the
33 transact command (to keep the mid, tid etc around).
34 Plus the fid to examine and notify private data
35 *****************************************************************************/
37 struct change_notify {
38 struct change_notify *next, *prev;
40 connection_struct *conn;
42 char request_buf[smb_size];
46 static struct change_notify *change_notify_list;
48 /****************************************************************************
49 Setup the common parts of the return packet and send it.
50 *****************************************************************************/
51 static void change_notify_reply_packet(char *inbuf, uint32 error_code)
53 char outbuf[smb_size+38];
55 memset(outbuf, '\0', sizeof(outbuf));
56 construct_reply_common(inbuf, outbuf);
59 * If we're returning a 'too much in the directory changed' we need to
60 * set this is an NT error status flags. If we don't then the (probably
61 * untested) code in the NT redirector has a bug in that it doesn't re-issue
62 * the change notify.... Ah - I *love* it when I get so deeply into this I
63 * can even determine how MS failed to test stuff and why.... :-). JRA.
66 SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);
70 * Seems NT needs a transact command with an error code
71 * in it. This is a longer packet than a simple error.
73 set_message(outbuf,18,0,False);
75 send_smb(smbd_server_fd(),outbuf);
78 /****************************************************************************
79 remove an entry from the list and free it, also closing any
80 directory handle if necessary
81 Notice the horrible stuff we have to do because this is a singly linked list.
82 *****************************************************************************/
83 static void change_notify_remove(struct change_notify *cnbp)
85 cnotify->remove_notify(cnbp->change_data);
86 DLIST_REMOVE(change_notify_list, cnbp);
92 /****************************************************************************
93 Delete entries by fnum from the change notify pending queue.
94 *****************************************************************************/
95 void remove_pending_change_notify_requests_by_fid(files_struct *fsp)
97 struct change_notify *cnbp, *next;
99 for (cnbp=change_notify_list; cnbp; cnbp=next) {
101 if (cnbp->fsp->fnum == fsp->fnum) {
102 change_notify_remove(cnbp);
107 /****************************************************************************
108 Delete entries by mid from the change notify pending queue. Always send reply.
109 *****************************************************************************/
110 void remove_pending_change_notify_requests_by_mid(int mid)
112 struct change_notify *cnbp, *next;
114 for (cnbp=change_notify_list; cnbp; cnbp=next) {
116 if(SVAL(cnbp->request_buf,smb_mid) == mid) {
117 change_notify_reply_packet(cnbp->request_buf,NT_STATUS_CANCELLED);
118 change_notify_remove(cnbp);
123 /****************************************************************************
124 Delete entries by filename and cnum from the change notify pending queue.
126 *****************************************************************************/
127 void remove_pending_change_notify_requests_by_filename(files_struct *fsp)
129 struct change_notify *cnbp, *next;
131 for (cnbp=change_notify_list; cnbp; cnbp=next) {
134 * We know it refers to the same directory if the connection number and
135 * the filename are identical.
137 if((cnbp->fsp->conn == fsp->conn) && strequal(cnbp->fsp->fsp_name,fsp->fsp_name)) {
138 change_notify_reply_packet(cnbp->request_buf,NT_STATUS_CANCELLED);
139 change_notify_remove(cnbp);
144 /****************************************************************************
145 Return true if there are pending change notifies.
146 ****************************************************************************/
147 BOOL change_notifies_pending(void)
149 return (change_notify_list != NULL);
152 /****************************************************************************
153 Process the change notify queue. Note that this is only called as root.
154 Returns True if there are still outstanding change notify requests on the
156 *****************************************************************************/
157 BOOL process_pending_change_notify_queue(time_t t)
159 struct change_notify *cnbp, *next;
162 for (cnbp=change_notify_list; cnbp; cnbp=next) {
165 vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(cnbp->request_buf,smb_uid);
167 if (cnotify->check_notify(cnbp->conn, vuid, cnbp->fsp->fsp_name, cnbp->flags, cnbp->change_data, t)) {
168 change_notify_reply_packet(cnbp->request_buf,STATUS_NOTIFY_ENUM_DIR);
169 change_notify_remove(cnbp);
173 return (change_notify_list != NULL);
176 /****************************************************************************
177 * Now queue an entry on the notify change list.
178 * We only need to save smb_size bytes from this incoming packet
179 * as we will always by returning a 'read the directory yourself'
181 ****************************************************************************/
182 BOOL change_notify_set(char *inbuf, files_struct *fsp, connection_struct *conn, uint32 flags)
184 struct change_notify *cnbp;
186 if((cnbp = (struct change_notify *)malloc(sizeof(*cnbp))) == NULL) {
187 DEBUG(0,("call_nt_transact_notify_change: malloc fail !\n" ));
193 memcpy(cnbp->request_buf, inbuf, smb_size);
197 cnbp->change_data = cnotify->register_notify(conn, fsp->fsp_name, flags);
199 if (!cnbp->change_data) {
204 DLIST_ADD(change_notify_list, cnbp);
210 /****************************************************************************
211 initialise the change notify subsystem
212 ****************************************************************************/
213 BOOL init_change_notify(void)
215 #if HAVE_KERNEL_CHANGE_NOTIFY
216 cnotify = kernel_notify_init();
218 if (!cnotify) cnotify = hash_notify_init();
221 DEBUG(0,("Failed to init change notify system\n"));