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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
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the Free Software Foundation ; either version 3 of the License , or
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( 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
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along with this program . If not , see < http : //www.gnu.org/licenses/>.
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*/
# 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 ;
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req = smb2_request_init_tree ( tree , SMB2_OP_READ , 0x30 , true , 0 ) ;
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if ( req = = NULL ) return NULL ;
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SCVAL ( req - > out . body , 0x02 , 0 ) ; /* pad */
SCVAL ( req - > out . body , 0x03 , 0 ) ; /* reserved */
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SIVAL ( req - > out . body , 0x04 , io - > in . length ) ;
SBVAL ( req - > out . body , 0x08 , io - > in . offset ) ;
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smb2_push_handle ( req - > out . body + 0x10 , & io - > in . file . handle ) ;
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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 ) ;
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req - > credit_charge = ( MAX ( io - > in . length , 1 ) - 1 ) / 65536 + 1 ;
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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 )
{
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NTSTATUS status ;
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if ( ! smb2_request_receive ( req ) | |
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! smb2_request_is_ok ( req ) ) {
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return smb2_request_destroy ( req ) ;
}
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SMB2_CHECK_PACKET_RECV ( req , 0x10 , true ) ;
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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 ;
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}
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io - > out . remaining = IVAL ( req - > in . body , 0x08 ) ;
io - > out . reserved = IVAL ( req - > in . body , 0x0C ) ;
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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 ) ;
}