--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ change notify handling
+ Copyright (C) Andrew Tridgell 2000
+ Copyright (C) Jeremy Allison 1994-1998
+
+ 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"
+
+static struct cnotify_fns *cnotify;
+
+/****************************************************************************
+ This is the structure to queue to implement NT change
+ notify. It consists of smb_size bytes stored from the
+ transact command (to keep the mid, tid etc around).
+ Plus the fid to examine and notify private data.
+*****************************************************************************/
+
+struct change_notify {
+ struct change_notify *next, *prev;
+ files_struct *fsp;
+ connection_struct *conn;
+ uint32 flags;
+ char request_buf[smb_size];
+ void *change_data;
+};
+
+static struct change_notify *change_notify_list;
+
+/****************************************************************************
+ Setup the common parts of the return packet and send it.
+*****************************************************************************/
+
+static void change_notify_reply_packet(char *inbuf, NTSTATUS error_code)
+{
+ char outbuf[smb_size+38];
+
+ memset(outbuf, '\0', sizeof(outbuf));
+ construct_reply_common(inbuf, outbuf);
+
+ ERROR_NT(error_code);
+
+ /*
+ * Seems NT needs a transact command with an error code
+ * in it. This is a longer packet than a simple error.
+ */
+ set_message(outbuf,18,0,False);
+
+ show_msg(outbuf);
+ if (!send_smb(smbd_server_fd(),outbuf))
+ exit_server("change_notify_reply_packet: send_smb failed.");
+}
+
+/****************************************************************************
+ Remove an entry from the list and free it, also closing any
+ directory handle if necessary.
+*****************************************************************************/
+
+static void change_notify_remove(struct change_notify *cnbp)
+{
+ cnotify->remove_notify(cnbp->change_data);
+ DLIST_REMOVE(change_notify_list, cnbp);
+ ZERO_STRUCTP(cnbp);
+ SAFE_FREE(cnbp);
+}
+
+/****************************************************************************
+ Delete entries by fnum from the change notify pending queue.
+*****************************************************************************/
+
+void remove_pending_change_notify_requests_by_fid(files_struct *fsp, NTSTATUS status)
+{
+ struct change_notify *cnbp, *next;
+
+ for (cnbp=change_notify_list; cnbp; cnbp=next) {
+ next=cnbp->next;
+ if (cnbp->fsp->fnum == fsp->fnum) {
+ change_notify_reply_packet(cnbp->request_buf,status);
+ change_notify_remove(cnbp);
+ }
+ }
+}
+
+/****************************************************************************
+ Delete entries by mid from the change notify pending queue. Always send reply.
+*****************************************************************************/
+
+void remove_pending_change_notify_requests_by_mid(int mid)
+{
+ struct change_notify *cnbp, *next;
+
+ for (cnbp=change_notify_list; cnbp; cnbp=next) {
+ next=cnbp->next;
+ if(SVAL(cnbp->request_buf,smb_mid) == mid) {
+ change_notify_reply_packet(cnbp->request_buf,NT_STATUS_CANCELLED);
+ change_notify_remove(cnbp);
+ }
+ }
+}
+
+/****************************************************************************
+ Delete entries by filename and cnum from the change notify pending queue.
+ Always send reply.
+*****************************************************************************/
+
+void remove_pending_change_notify_requests_by_filename(files_struct *fsp, NTSTATUS status)
+{
+ struct change_notify *cnbp, *next;
+
+ for (cnbp=change_notify_list; cnbp; cnbp=next) {
+ next=cnbp->next;
+ /*
+ * We know it refers to the same directory if the connection number and
+ * the filename are identical.
+ */
+ if((cnbp->fsp->conn == fsp->conn) && strequal(cnbp->fsp->fsp_name,fsp->fsp_name)) {
+ change_notify_reply_packet(cnbp->request_buf,status);
+ change_notify_remove(cnbp);
+ }
+ }
+}
+
+/****************************************************************************
+ Return true if there are pending change notifies.
+****************************************************************************/
+
+int change_notify_timeout(void)
+{
+ return cnotify->select_time;
+}
+
+/****************************************************************************
+ Process the change notify queue. Note that this is only called as root.
+ Returns True if there are still outstanding change notify requests on the
+ queue.
+*****************************************************************************/
+
+BOOL process_pending_change_notify_queue(time_t t)
+{
+ struct change_notify *cnbp, *next;
+ uint16 vuid;
+
+ for (cnbp=change_notify_list; cnbp; cnbp=next) {
+ next=cnbp->next;
+
+ vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(cnbp->request_buf,smb_uid);
+
+ if (cnotify->check_notify(cnbp->conn, vuid, cnbp->fsp->fsp_name, cnbp->flags, cnbp->change_data, t)) {
+ DEBUG(10,("process_pending_change_notify_queue: dir %s changed !\n", cnbp->fsp->fsp_name ));
+ change_notify_reply_packet(cnbp->request_buf,STATUS_NOTIFY_ENUM_DIR);
+ change_notify_remove(cnbp);
+ }
+ }
+
+ return (change_notify_list != NULL);
+}
+
+/****************************************************************************
+ Now queue an entry on the notify change list.
+ We only need to save smb_size bytes from this incoming packet
+ as we will always by returning a 'read the directory yourself'
+ error.
+****************************************************************************/
+
+BOOL change_notify_set(char *inbuf, files_struct *fsp, connection_struct *conn, uint32 flags)
+{
+ struct change_notify *cnbp;
+
+ if((cnbp = SMB_MALLOC_P(struct change_notify)) == NULL) {
+ DEBUG(0,("change_notify_set: malloc fail !\n" ));
+ return -1;
+ }
+
+ ZERO_STRUCTP(cnbp);
+
+ memcpy(cnbp->request_buf, inbuf, smb_size);
+ cnbp->fsp = fsp;
+ cnbp->conn = conn;
+ cnbp->flags = flags;
+ cnbp->change_data = cnotify->register_notify(conn, fsp->fsp_name, flags);
+
+ if (!cnbp->change_data) {
+ SAFE_FREE(cnbp);
+ return False;
+ }
+
+ DLIST_ADD(change_notify_list, cnbp);
+
+ /* Push the MID of this packet on the signing queue. */
+ srv_defer_sign_response(SVAL(inbuf,smb_mid));
+
+ return True;
+}
+
+/****************************************************************************
+ Initialise the change notify subsystem.
+****************************************************************************/
+
+BOOL init_change_notify(void)
+{
+#if HAVE_KERNEL_CHANGE_NOTIFY
+ if (lp_kernel_change_notify())
+ cnotify = kernel_notify_init();
+#endif
+ if (!cnotify) cnotify = hash_notify_init();
+
+ if (!cnotify) {
+ DEBUG(0,("Failed to init change notify system\n"));
+ return False;
+ }
+
+ return True;
+}
projects / samba / blobdiff