/* Unix SMB/Netbios implementation. Version 3.0 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); 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) { struct change_notify *cnbp, *next; for (cnbp=change_notify_list; cnbp; cnbp=next) { next=cnbp->next; if (cnbp->fsp->fnum == fsp->fnum) { 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) { 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,NT_STATUS_CANCELLED); 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 = (struct change_notify *)malloc(sizeof(*cnbp))) == NULL) { DEBUG(0,("call_nt_transact_notify_change: 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); return True; } /**************************************************************************** Initialise the change notify subsystem. ****************************************************************************/ BOOL init_change_notify(void) { #if HAVE_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; }