source4/libcli/raw/rawnotify.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client change notify operations
   4    Copyright (C) Andrew Tridgell 2003
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "libcli/raw/libcliraw.h"
  22 #include "libcli/raw/raw_proto.h"
  23 #include "../lib/util/dlinklist.h"
  24
  25 /****************************************************************************
  26 change notify (async send)
  27 ****************************************************************************/
  28 _PUBLIC_ struct smbcli_request *smb_raw_changenotify_send(struct smbcli_tree *tree, union smb_notify *parms)
  29 {
  30         struct smb_nttrans nt;
  31         uint8_t setup[8];
  32
  33         if (parms->nttrans.level != RAW_NOTIFY_NTTRANS) {
  34                 return NULL;
  35         }
  36
  37         nt.in.max_setup = 0;
  38         nt.in.max_param = parms->nttrans.in.buffer_size;
  39         nt.in.max_data = 0;
  40         nt.in.setup_count = 4;
  41         nt.in.setup = setup;
  42         SIVAL(setup, 0, parms->nttrans.in.completion_filter);
  43         SSVAL(setup, 4, parms->nttrans.in.file.fnum);
  44         SSVAL(setup, 6, parms->nttrans.in.recursive);
  45         nt.in.function = NT_TRANSACT_NOTIFY_CHANGE;
  46         nt.in.params = data_blob(NULL, 0);
  47         nt.in.data = data_blob(NULL, 0);
  48
  49         return smb_raw_nttrans_send(tree, &nt);
  50 }
  51
  52 /****************************************************************************
  53 change notify (async recv)
  54 ****************************************************************************/
  55 _PUBLIC_ NTSTATUS smb_raw_changenotify_recv(struct smbcli_request *req,
  56                                    TALLOC_CTX *mem_ctx, union smb_notify *parms)
  57 {
  58         struct smb_nttrans nt;
  59         NTSTATUS status;
  60         uint32_t ofs, i;
  61         struct smbcli_session *session = req?req->session:NULL;
  62
  63         if (parms->nttrans.level != RAW_NOTIFY_NTTRANS) {
  64                 return NT_STATUS_INVALID_LEVEL;
  65         }
  66
  67         status = smb_raw_nttrans_recv(req, mem_ctx, &nt);
  68         if (!NT_STATUS_IS_OK(status)) {
  69                 return status;
  70         }
  71
  72         parms->nttrans.out.changes = NULL;
  73         parms->nttrans.out.num_changes = 0;
  74
  75         /* count them */
  76         for (ofs=0; nt.out.params.length - ofs > 12; ) {
  77                 uint32_t next = IVAL(nt.out.params.data, ofs);
  78                 parms->nttrans.out.num_changes++;
  79                 if (next == 0 ||
  80                     ofs + next >= nt.out.params.length) break;
  81                 ofs += next;
  82         }
  83
  84         /* allocate array */
  85         parms->nttrans.out.changes = talloc_array(mem_ctx, struct notify_changes, parms->nttrans.out.num_changes);
  86         if (!parms->nttrans.out.changes) {
  87                 return NT_STATUS_NO_MEMORY;
  88         }
  89
  90         for (i=ofs=0; i<parms->nttrans.out.num_changes; i++) {
  91                 parms->nttrans.out.changes[i].action = IVAL(nt.out.params.data, ofs+4);
  92                 smbcli_blob_pull_string(session, mem_ctx, &nt.out.params,
  93                                         &parms->nttrans.out.changes[i].name,
  94                                         ofs+8, ofs+12, STR_UNICODE);
  95                 ofs += IVAL(nt.out.params.data, ofs);
  96         }
  97
  98         return NT_STATUS_OK;
  99 }
 100
 101 /****************************************************************************
 102   handle ntcancel replies from the server,
 103   as the MID of the real reply and the ntcancel reply is the same
 104   we need to do find out to what request the reply belongs
 105 ****************************************************************************/
 106 struct smbcli_request *smbcli_handle_ntcancel_reply(struct smbcli_request *req,
 107                                                     size_t len, const uint8_t *hdr)
 108 {
 109         struct smbcli_request *ntcancel;
 110
 111         if (!req) return req;
 112
 113         if (!req->ntcancel) return req;
 114
 115         if (len >= MIN_SMB_SIZE + NBT_HDR_SIZE &&
 116             (CVAL(hdr, HDR_FLG) & FLAG_REPLY) &&
 117              CVAL(hdr,HDR_COM) == SMBntcancel) {
 118                 ntcancel = req->ntcancel;
 119                 DLIST_REMOVE(req->ntcancel, ntcancel);
 120
 121                 /*
 122                  * TODO: untill we understand how the
 123                  *       smb_signing works for this case we
 124                  *       return NULL, to just ignore the packet
 125                  */
 126                 /*return ntcancel;*/
 127                 return NULL;
 128         }
 129
 130         return req;
 131 }
 132
 133 /****************************************************************************
 134  Send a NT Cancel request - used to hurry along a pending request. Usually
 135  used to cancel a pending change notify request
 136  note that this request does not expect a response!
 137 ****************************************************************************/
 138 NTSTATUS smb_raw_ntcancel(struct smbcli_request *oldreq)
 139 {
 140         struct smbcli_request *req;
 141
 142         req = smbcli_request_setup_transport(oldreq->transport, SMBntcancel, 0, 0);
 143
 144         SSVAL(req->out.hdr, HDR_MID, SVAL(oldreq->out.hdr, HDR_MID));
 145         SSVAL(req->out.hdr, HDR_PID, SVAL(oldreq->out.hdr, HDR_PID));
 146         SSVAL(req->out.hdr, HDR_TID, SVAL(oldreq->out.hdr, HDR_TID));
 147         SSVAL(req->out.hdr, HDR_UID, SVAL(oldreq->out.hdr, HDR_UID));
 148
 149         /* this request does not expect a reply, so tell the signing
 150            subsystem not to allocate an id for a reply */
 151         req->sign_single_increment = 1;
 152         req->one_way_request = 1;
 153
 154         /*
 155          * smbcli_request_send() free's oneway requests
 156          * but we want to keep it under oldreq->ntcancel
 157          */
 158         req->do_not_free = true;
 159         talloc_steal(oldreq, req);
 160
 161         smbcli_request_send(req);
 162
 163         DLIST_ADD_END(oldreq->ntcancel, req, struct smbcli_request *);
 164
 165         return NT_STATUS_OK;
 166 }