Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             : 
       4             :    SMB2 client read call
       5             : 
       6             :    Copyright (C) Andrew Tridgell 2005
       7             :    
       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 3 of the License, or
      11             :    (at your option) any later version.
      12             :    
      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.
      17             :    
      18             :    You should have received a copy of the GNU General Public License
      19             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      20             : */
      21             : 
      22             : #include "includes.h"
      23             : #include "libcli/smb2/smb2.h"
      24             : #include "libcli/smb2/smb2_calls.h"
      25             : 
      26             : /*
      27             :   send a read request
      28             : */
      29        2455 : struct smb2_request *smb2_read_send(struct smb2_tree *tree, struct smb2_read *io)
      30             : {
      31           2 :         struct smb2_request *req;
      32             : 
      33        2455 :         req = smb2_request_init_tree(tree, SMB2_OP_READ, 0x30, true, 0);
      34        2455 :         if (req == NULL) return NULL;
      35             : 
      36        2455 :         SCVAL(req->out.body, 0x02, 0); /* pad */
      37        2455 :         SCVAL(req->out.body, 0x03, 0); /* reserved */
      38        2455 :         SIVAL(req->out.body, 0x04, io->in.length);
      39        2455 :         SBVAL(req->out.body, 0x08, io->in.offset);
      40        2455 :         smb2_push_handle(req->out.body+0x10, &io->in.file.handle);
      41        2455 :         SIVAL(req->out.body, 0x20, io->in.min_count);
      42        2455 :         SIVAL(req->out.body, 0x24, io->in.channel);
      43        2455 :         SIVAL(req->out.body, 0x28, io->in.remaining);
      44        2455 :         SSVAL(req->out.body, 0x2C, io->in.channel_offset);
      45        2455 :         SSVAL(req->out.body, 0x2E, io->in.channel_length);
      46             : 
      47        2455 :         req->credit_charge = (MAX(io->in.length, 1) - 1)/ 65536 + 1;
      48             : 
      49        2455 :         smb2_transport_send(req);
      50             : 
      51        2455 :         return req;
      52             : }
      53             : 
      54             : 
      55             : /*
      56             :   recv a read reply
      57             : */
      58        2455 : NTSTATUS smb2_read_recv(struct smb2_request *req, 
      59             :                         TALLOC_CTX *mem_ctx, struct smb2_read *io)
      60             : {
      61           2 :         NTSTATUS status;
      62             : 
      63        2457 :         if (!smb2_request_receive(req) || 
      64        2455 :             !smb2_request_is_ok(req)) {
      65         356 :                 return smb2_request_destroy(req);
      66             :         }
      67             : 
      68        2099 :         SMB2_CHECK_PACKET_RECV(req, 0x10, true);
      69             : 
      70        2099 :         status = smb2_pull_o16s32_blob(&req->in, mem_ctx, req->in.body+0x02, &io->out.data);
      71        2099 :         if (!NT_STATUS_IS_OK(status)) {
      72           0 :                 smb2_request_destroy(req);
      73           0 :                 return status;
      74             :         }
      75             : 
      76        2099 :         io->out.remaining = IVAL(req->in.body, 0x08);
      77        2099 :         io->out.reserved  = IVAL(req->in.body, 0x0C);
      78             : 
      79        2099 :         return smb2_request_destroy(req);
      80             : }
      81             : 
      82             : /*
      83             :   sync read request
      84             : */
      85        2379 : NTSTATUS smb2_read(struct smb2_tree *tree, TALLOC_CTX *mem_ctx, struct smb2_read *io)
      86             : {
      87        2379 :         struct smb2_request *req = smb2_read_send(tree, io);
      88        2379 :         return smb2_read_recv(req, mem_ctx, io);
      89             : }