source: vendor/current/source4/libcli/smb2/ioctl.c

/* 
   Unix SMB/CIFS implementation.

   SMB2 client ioctl 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"
#include "librpc/gen_ndr/ioctl.h"

/*
  send a ioctl request
*/
struct smb2_request *smb2_ioctl_send(struct smb2_tree *tree, struct smb2_ioctl *io)
{
        NTSTATUS status;
        struct smb2_request *req;

        req = smb2_request_init_tree(tree, SMB2_OP_IOCTL, 0x38, true,
                                     io->in.in.length+io->in.out.length);
        if (req == NULL) return NULL;

        SSVAL(req->out.body, 0x02, 0); /* pad */
        SIVAL(req->out.body, 0x04, io->in.function);
        smb2_push_handle(req->out.body+0x08, &io->in.file.handle);

        status = smb2_push_o32s32_blob(&req->out, 0x18, io->in.out);
        if (!NT_STATUS_IS_OK(status)) {
                talloc_free(req);
                return NULL;
        }

        SIVAL(req->out.body, 0x20, io->in.unknown2);

        status = smb2_push_o32s32_blob(&req->out, 0x24, io->in.in);
        if (!NT_STATUS_IS_OK(status)) {
                talloc_free(req);
                return NULL;
        }

        SIVAL(req->out.body, 0x2C, io->in.max_response_size);
        SBVAL(req->out.body, 0x30, io->in.flags);

        smb2_transport_send(req);

        return req;
}

/*
 * 3.3.4.4 Sending an Error Response
 */
static bool smb2_ioctl_is_failure(uint32_t ctl_code, NTSTATUS status,
                                  size_t data_size)
{
        if (NT_STATUS_IS_OK(status)) {
                return false;
        }

        if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)
         && ((ctl_code == FSCTL_PIPE_TRANSCEIVE)
          || (ctl_code == FSCTL_PIPE_PEEK)
          || (ctl_code == FSCTL_DFS_GET_REFERRALS))) {
                return false;
        }

        if (((ctl_code == FSCTL_SRV_COPYCHUNK)
                                || (ctl_code == FSCTL_SRV_COPYCHUNK_WRITE))
         && (data_size == sizeof(struct srv_copychunk_rsp))) {
                /*
                 * copychunk responses may come with copychunk data or error
                 * response data, independent of status.
                 */
                return false;
        }

        return true;
}

/*
  recv a ioctl reply
*/
NTSTATUS smb2_ioctl_recv(struct smb2_request *req,
                         TALLOC_CTX *mem_ctx, struct smb2_ioctl *io)
{
        NTSTATUS status;

        if (!smb2_request_receive(req) ||
            smb2_ioctl_is_failure(io->in.function, req->status,
                                  req->in.bufinfo.data_size)) {
                return smb2_request_destroy(req);
        }

        SMB2_CHECK_PACKET_RECV(req, 0x30, true);

        io->out._pad       = SVAL(req->in.body, 0x02);
        io->out.function   = IVAL(req->in.body, 0x04);
        smb2_pull_handle(req->in.body+0x08, &io->out.file.handle);

        status = smb2_pull_o32s32_blob(&req->in, mem_ctx, req->in.body+0x18, &io->out.in);
        if (!NT_STATUS_IS_OK(status)) {
                smb2_request_destroy(req);
                return status;
        }

        status = smb2_pull_o32s32_blob(&req->in, mem_ctx, req->in.body+0x20, &io->out.out);
        if (!NT_STATUS_IS_OK(status)) {
                smb2_request_destroy(req);
                return status;
        }

        io->out.unknown2 = IVAL(req->in.body, 0x28);
        io->out.unknown3 = IVAL(req->in.body, 0x2C);

        return smb2_request_destroy(req);
}

/*
  sync ioctl request
*/
NTSTATUS smb2_ioctl(struct smb2_tree *tree, TALLOC_CTX *mem_ctx, struct smb2_ioctl *io)
{
        struct smb2_request *req = smb2_ioctl_send(tree, io);
        return smb2_ioctl_recv(req, mem_ctx, io);
}