2 Unix SMB/Netbios implementation.
5 Copyright (C) Andrew Tridgell 2000
6 Copyright (C) Jeremy Allison 1994-1998
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 extern int DEBUGLEVEL;
27 static struct cnotify_fns *cnotify;
29 /****************************************************************************
30 This is the structure to queue to implement NT change
31 notify. It consists of smb_size bytes stored from the
32 transact command (to keep the mid, tid etc around).
33 Plus the fid to examine and notify private data
34 *****************************************************************************/
36 struct change_notify {
37 struct change_notify *next, *prev;
39 connection_struct *conn;
41 char request_buf[smb_size];
45 static struct change_notify *change_notify_list;
47 /****************************************************************************
48 Setup the common parts of the return packet and send it.
49 *****************************************************************************/
50 static void change_notify_reply_packet(char *inbuf, uint32 error_code)
52 char outbuf[smb_size+38];
54 memset(outbuf, '\0', sizeof(outbuf));
55 construct_reply_common(inbuf, outbuf);
58 * If we're returning a 'too much in the directory changed' we need to
59 * set this is an NT error status flags. If we don't then the (probably
60 * untested) code in the NT redirector has a bug in that it doesn't re-issue
61 * the change notify.... Ah - I *love* it when I get so deeply into this I
62 * can even determine how MS failed to test stuff and why.... :-). JRA.
65 SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);
69 * Seems NT needs a transact command with an error code
70 * in it. This is a longer packet than a simple error.
72 set_message(outbuf,18,0,False);
74 send_smb(smbd_server_fd(),outbuf);
77 /****************************************************************************
78 remove an entry from the list and free it, also closing any
79 directory handle if necessary
80 Notice the horrible stuff we have to do because this is a singly linked list.
81 *****************************************************************************/
82 static void change_notify_remove(struct change_notify *cnbp)
84 cnotify->remove_notify(cnbp->change_data);
85 DLIST_REMOVE(change_notify_list, cnbp);
91 /****************************************************************************
92 Delete entries by fnum from the change notify pending queue.
93 *****************************************************************************/
94 void remove_pending_change_notify_requests_by_fid(files_struct *fsp)
96 struct change_notify *cnbp, *next;
98 for (cnbp=change_notify_list; cnbp; cnbp=next) {
100 if (cnbp->fsp->fnum == fsp->fnum) {
101 change_notify_remove(cnbp);
106 /****************************************************************************
107 Delete entries by mid from the change notify pending queue. Always send reply.
108 *****************************************************************************/
109 void remove_pending_change_notify_requests_by_mid(int mid)
111 struct change_notify *cnbp, *next;
113 for (cnbp=change_notify_list; cnbp; cnbp=next) {
115 if(SVAL(cnbp->request_buf,smb_mid) == mid) {
116 change_notify_reply_packet(cnbp->request_buf,NT_STATUS_CANCELLED);
117 change_notify_remove(cnbp);
122 /****************************************************************************
123 Delete entries by filename and cnum from the change notify pending queue.
125 *****************************************************************************/
126 void remove_pending_change_notify_requests_by_filename(files_struct *fsp)
128 struct change_notify *cnbp, *next;
130 for (cnbp=change_notify_list; cnbp; cnbp=next) {
133 * We know it refers to the same directory if the connection number and
134 * the filename are identical.
136 if((cnbp->fsp->conn == fsp->conn) && strequal(cnbp->fsp->fsp_name,fsp->fsp_name)) {
137 change_notify_reply_packet(cnbp->request_buf,NT_STATUS_CANCELLED);
138 change_notify_remove(cnbp);
143 /****************************************************************************
144 Return true if there are pending change notifies.
145 ****************************************************************************/
146 int change_notify_timeout(void)
148 return cnotify->select_time;
151 /****************************************************************************
152 Process the change notify queue. Note that this is only called as root.
153 Returns True if there are still outstanding change notify requests on the
155 *****************************************************************************/
156 BOOL process_pending_change_notify_queue(time_t t)
158 struct change_notify *cnbp, *next;
161 for (cnbp=change_notify_list; cnbp; cnbp=next) {
164 vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(cnbp->request_buf,smb_uid);
166 if (cnotify->check_notify(cnbp->conn, vuid, cnbp->fsp->fsp_name, cnbp->flags, cnbp->change_data, t)) {
167 change_notify_reply_packet(cnbp->request_buf,STATUS_NOTIFY_ENUM_DIR);
168 change_notify_remove(cnbp);
172 return (change_notify_list != NULL);
175 /****************************************************************************
176 * Now queue an entry on the notify change list.
177 * We only need to save smb_size bytes from this incoming packet
178 * as we will always by returning a 'read the directory yourself'
180 ****************************************************************************/
181 BOOL change_notify_set(char *inbuf, files_struct *fsp, connection_struct *conn, uint32 flags)
183 struct change_notify *cnbp;
185 if((cnbp = (struct change_notify *)malloc(sizeof(*cnbp))) == NULL) {
186 DEBUG(0,("call_nt_transact_notify_change: malloc fail !\n" ));
192 memcpy(cnbp->request_buf, inbuf, smb_size);
196 cnbp->change_data = cnotify->register_notify(conn, fsp->fsp_name, flags);
198 if (!cnbp->change_data) {
203 DLIST_ADD(change_notify_list, cnbp);
209 /****************************************************************************
210 initialise the change notify subsystem
211 ****************************************************************************/
212 BOOL init_change_notify(void)
214 #if HAVE_KERNEL_CHANGE_NOTIFY
215 cnotify = kernel_notify_init();
217 if (!cnotify) cnotify = hash_notify_init();
220 DEBUG(0,("Failed to init change notify system\n"));