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/*
Unix SMB/CIFS implementation.
SMB2 client read call
Copyright (C) Andrew Tridgell 2005
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
/*
send a read request
*/
struct smb2_request *smb2_read_send(struct smb2_tree *tree, struct smb2_read *io)
{
struct smb2_request *req;
req = smb2_request_init_tree(tree, SMB2_OP_READ, 0x30, true, 0);
if (req == NULL) return NULL;
SCVAL(req->out.body, 0x02, 0); /* pad */
SCVAL(req->out.body, 0x03, 0); /* reserved */
SIVAL(req->out.body, 0x04, io->in.length);
SBVAL(req->out.body, 0x08, io->in.offset);
smb2_push_handle(req->out.body+0x10, &io->in.file.handle);
SIVAL(req->out.body, 0x20, io->in.min_count);
SIVAL(req->out.body, 0x24, io->in.channel);
SIVAL(req->out.body, 0x28, io->in.remaining);
SSVAL(req->out.body, 0x2C, io->in.channel_offset);
SSVAL(req->out.body, 0x2E, io->in.channel_length);
req->credit_charge = (MAX(io->in.length, 1) - 1)/ 65536 + 1;
smb2_transport_send(req);
return req;
}
/*
recv a read reply
*/
NTSTATUS smb2_read_recv(struct smb2_request *req,
TALLOC_CTX *mem_ctx, struct smb2_read *io)
{
NTSTATUS status;
if (!smb2_request_receive(req) ||
!smb2_request_is_ok(req)) {
return smb2_request_destroy(req);
}
SMB2_CHECK_PACKET_RECV(req, 0x10, true);
status = smb2_pull_o16s32_blob(&req->in, mem_ctx, req->in.body+0x02, &io->out.data);
if (!NT_STATUS_IS_OK(status)) {
smb2_request_destroy(req);
return status;
}
io->out.remaining = IVAL(req->in.body, 0x08);
io->out.reserved = IVAL(req->in.body, 0x0C);
return smb2_request_destroy(req);
}
/*
sync read request
*/
NTSTATUS smb2_read(struct smb2_tree *tree, TALLOC_CTX *mem_ctx, struct smb2_read *io)
{
struct smb2_request *req = smb2_read_send(tree, io);
return smb2_read_recv(req, mem_ctx, io);
}
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