source: vendor/3.6.0/source4/libcli/raw/rawtrans.c

/* 
   Unix SMB/CIFS implementation.
   raw trans/trans2/nttrans operations

   Copyright (C) James Myers 2003 <myersjj@samba.org>
   
   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 "../lib/util/dlinklist.h"
#include "libcli/raw/libcliraw.h"
#include "libcli/raw/raw_proto.h"

#define TORTURE_TRANS_DATA 0

/*
  check out of bounds for incoming data
*/
static bool raw_trans_oob(struct smbcli_request *req,
                          unsigned int offset, unsigned int count)
{
        uint8_t *ptr;

        if (count == 0) {
                return false;
        }

        ptr = req->in.hdr + offset;
        
        /* be careful with wraparound! */
        if ((uintptr_t)ptr < (uintptr_t)req->in.data ||
            (uintptr_t)ptr >= (uintptr_t)req->in.data + req->in.data_size ||
            count > req->in.data_size ||
            (uintptr_t)ptr + count > (uintptr_t)req->in.data + req->in.data_size) {
                return true;
        }
        return false;   
}

static size_t raw_trans_space_left(struct smbcli_request *req)
{
        if (req->transport->negotiate.max_xmit <= req->out.size) {
                return 0;
        }

        return req->transport->negotiate.max_xmit - req->out.size;
}

struct smb_raw_trans2_recv_state {
        uint8_t command;
        uint32_t params_total;
        uint32_t data_total;
        uint32_t params_left;
        uint32_t data_left;
        bool got_first;
        uint32_t recvd_data;
        uint32_t recvd_param;
        struct smb_trans2 io;
};

NTSTATUS smb_raw_trans2_recv(struct smbcli_request *req,
                             TALLOC_CTX *mem_ctx,
                             struct smb_trans2 *parms)
{
        struct smb_raw_trans2_recv_state *state;

        if (!smbcli_request_receive(req) ||
            smbcli_request_is_error(req)) {
                goto failed;
        }

        state = talloc_get_type(req->recv_helper.private_data,
                                struct smb_raw_trans2_recv_state);

        parms->out = state->io.out;
        talloc_steal(mem_ctx, parms->out.setup);
        talloc_steal(mem_ctx, parms->out.params.data);
        talloc_steal(mem_ctx, parms->out.data.data);
        talloc_free(state);

        ZERO_STRUCT(req->recv_helper);

failed:
        return smbcli_request_destroy(req);
}

static enum smbcli_request_state smb_raw_trans2_ship_rest(struct smbcli_request *req,
                                                          struct smb_raw_trans2_recv_state *state);

/*
 * This helper returns SMBCLI_REQUEST_RECV until all data has arrived
 */
static enum smbcli_request_state smb_raw_trans2_recv_helper(struct smbcli_request *req)
{
        struct smb_raw_trans2_recv_state *state = talloc_get_type(req->recv_helper.private_data,
                                                  struct smb_raw_trans2_recv_state);
        uint16_t param_count, param_ofs, param_disp;
        uint16_t data_count, data_ofs, data_disp;
        uint16_t total_data, total_param;
        uint8_t setup_count;

        /*
         * An NT RPC pipe call can return ERRDOS, ERRmoredata
         * to a trans call. This is not an error and should not
         * be treated as such.
         */
        if (smbcli_request_is_error(req)) {
                goto failed;
        }

        if (state->params_left > 0 || state->data_left > 0) {
                return smb_raw_trans2_ship_rest(req, state);
        }

        SMBCLI_CHECK_MIN_WCT(req, 10);

        total_data = SVAL(req->in.vwv, VWV(1));
        total_param = SVAL(req->in.vwv, VWV(0));
        setup_count = CVAL(req->in.vwv, VWV(9));

        param_count = SVAL(req->in.vwv, VWV(3));
        param_ofs   = SVAL(req->in.vwv, VWV(4));
        param_disp  = SVAL(req->in.vwv, VWV(5));

        data_count = SVAL(req->in.vwv, VWV(6));
        data_ofs   = SVAL(req->in.vwv, VWV(7));
        data_disp  = SVAL(req->in.vwv, VWV(8));

        if (!state->got_first) {
                if (total_param > 0) {
                        state->io.out.params = data_blob_talloc(state, NULL, total_param);
                        if (!state->io.out.params.data) {
                                goto nomem;
                        }
                }

                if (total_data > 0) {
                        state->io.out.data = data_blob_talloc(state, NULL, total_data);
                        if (!state->io.out.data.data) {
                                goto nomem;
                        }
                }

                if (setup_count > 0) {
                        uint16_t i;

                        SMBCLI_CHECK_WCT(req, 10 + setup_count);

                        state->io.out.setup_count = setup_count;
                        state->io.out.setup = talloc_array(state, uint16_t, setup_count);
                        if (!state->io.out.setup) {
                                goto nomem;
                        }
                        for (i=0; i < setup_count; i++) {
                                state->io.out.setup[i] = SVAL(req->in.vwv, VWV(10+i));
                        }
                }

                state->got_first = true;
        }

        if (total_data > state->io.out.data.length ||
            total_param > state->io.out.params.length) {
                /* they must *only* shrink */
                DEBUG(1,("smb_raw_trans2_recv_helper: data/params expanded!\n"));
                req->status = NT_STATUS_BUFFER_TOO_SMALL;
                goto failed;
        }

        state->io.out.data.length = total_data;
        state->io.out.params.length = total_param;

        if (data_count + data_disp > total_data ||
            param_count + param_disp > total_param) {
                DEBUG(1,("smb_raw_trans2_recv_helper: Buffer overflow\n"));
                req->status = NT_STATUS_BUFFER_TOO_SMALL;
                goto failed;
        }

        /* check the server isn't being nasty */
        if (raw_trans_oob(req, param_ofs, param_count) ||
            raw_trans_oob(req, data_ofs, data_count)) {
                DEBUG(1,("smb_raw_trans2_recv_helper: out of bounds parameters!\n"));
                req->status = NT_STATUS_BUFFER_TOO_SMALL;
                goto failed;
        }

        if (data_count) {
                memcpy(state->io.out.data.data + data_disp,
                       req->in.hdr + data_ofs,
                       data_count);
        }

        if (param_count) {
                memcpy(state->io.out.params.data + param_disp,
                       req->in.hdr + param_ofs,
                       param_count);
        }

        state->recvd_param += param_count;
        state->recvd_data += data_count;

        if (state->recvd_data < total_data ||
            state->recvd_param < total_param) {

                /* we don't need the in buffer any more */
                talloc_free(req->in.buffer);
                ZERO_STRUCT(req->in);

                /* we still wait for more data */
                DEBUG(10,("smb_raw_trans2_recv_helper: more data needed\n"));
                return SMBCLI_REQUEST_RECV;
        }

        DEBUG(10,("smb_raw_trans2_recv_helper: done\n"));
        return SMBCLI_REQUEST_DONE;

nomem:
        req->status = NT_STATUS_NO_MEMORY;
failed:
        return SMBCLI_REQUEST_ERROR;
}

_PUBLIC_ NTSTATUS smb_raw_trans_recv(struct smbcli_request *req,
                             TALLOC_CTX *mem_ctx,
                             struct smb_trans2 *parms)
{
        return smb_raw_trans2_recv(req, mem_ctx, parms);
}


/*
  trans/trans2 raw async interface - only BLOBs used in this interface.
*/
struct smbcli_request *smb_raw_trans_send_backend(struct smbcli_tree *tree,
                                                  struct smb_trans2 *parms,
                                                  uint8_t command)
{
        struct smb_raw_trans2_recv_state *state;
        struct smbcli_request *req;
        int i;
        int padding;
        size_t space_left;
        size_t namelen = 0;
        DATA_BLOB params_chunk;
        uint16_t ofs;
        uint16_t params_ofs = 0;
        DATA_BLOB data_chunk;
        uint16_t data_ofs = 0;

        if (parms->in.params.length > UINT16_MAX ||
            parms->in.data.length > UINT16_MAX) {
                DEBUG(3,("Attempt to send invalid trans2 request (params %u, data %u)\n",
                         (unsigned)parms->in.params.length, (unsigned)parms->in.data.length));
                return NULL;
        }
            

        if (command == SMBtrans)
                padding = 1;
        else
                padding = 3;
        
        req = smbcli_request_setup(tree, command,
                                   14 + parms->in.setup_count,
                                   padding);
        if (!req) {
                return NULL;
        }

        state = talloc_zero(req, struct smb_raw_trans2_recv_state);
        if (!state) {
                smbcli_request_destroy(req);
                return NULL;
        }

        state->command = command;

        /* make sure we don't leak data via the padding */
        memset(req->out.data, 0, padding);

        /* Watch out, this changes the req->out.* pointers */
        if (command == SMBtrans && parms->in.trans_name) {
                namelen = smbcli_req_append_string(req, parms->in.trans_name, 
                                                STR_TERMINATE);
        }

        ofs = PTR_DIFF(req->out.data,req->out.hdr)+padding+namelen;

        /* see how much bytes of the params block we can ship in the first request */
        space_left = raw_trans_space_left(req);

        params_chunk.length = MIN(parms->in.params.length, space_left);
        params_chunk.data = parms->in.params.data;
        params_ofs = ofs;

        state->params_left = parms->in.params.length - params_chunk.length;

        if (state->params_left > 0) {
                /* we copy the whole params block, if needed we can optimize that latter */
                state->io.in.params = data_blob_talloc(state, NULL, parms->in.params.length);
                if (!state->io.in.params.data) {
                        smbcli_request_destroy(req);
                        return NULL;
                }
                memcpy(state->io.in.params.data,
                       parms->in.params.data,
                       parms->in.params.length);
        }

        /* see how much bytes of the data block we can ship in the first request */
        space_left -= params_chunk.length;

#if TORTURE_TRANS_DATA
        if (space_left > 1) {
                space_left /= 2;
        }
#endif

        data_chunk.length = MIN(parms->in.data.length, space_left);
        data_chunk.data = parms->in.data.data;
        data_ofs = params_ofs + params_chunk.length;

        state->data_left = parms->in.data.length - data_chunk.length;

        if (state->data_left > 0) {
                /* we copy the whole params block, if needed we can optimize that latter */
                state->io.in.data = data_blob_talloc(state, NULL, parms->in.data.length);
                if (!state->io.in.data.data) {
                        smbcli_request_destroy(req);
                        return NULL;
                }
                memcpy(state->io.in.data.data,
                       parms->in.data.data,
                       parms->in.data.length);
        }

        state->params_total = parms->in.params.length;
        state->data_total = parms->in.data.length;

        /* primary request */
        SSVAL(req->out.vwv,VWV(0),parms->in.params.length);
        SSVAL(req->out.vwv,VWV(1),parms->in.data.length);
        SSVAL(req->out.vwv,VWV(2),parms->in.max_param);
        SSVAL(req->out.vwv,VWV(3),parms->in.max_data);
        SCVAL(req->out.vwv,VWV(4),parms->in.max_setup);
        SCVAL(req->out.vwv,VWV(4)+1,0); /* reserved */
        SSVAL(req->out.vwv,VWV(5),parms->in.flags);
        SIVAL(req->out.vwv,VWV(6),parms->in.timeout);
        SSVAL(req->out.vwv,VWV(8),0); /* reserved */
        SSVAL(req->out.vwv,VWV(9),params_chunk.length);
        SSVAL(req->out.vwv,VWV(10),params_ofs);
        SSVAL(req->out.vwv,VWV(11),data_chunk.length);
        SSVAL(req->out.vwv,VWV(12),data_ofs);
        SCVAL(req->out.vwv,VWV(13),parms->in.setup_count);
        SCVAL(req->out.vwv,VWV(13)+1,0); /* reserved */
        for (i=0;i<parms->in.setup_count;i++)   {
                SSVAL(req->out.vwv,VWV(14)+VWV(i),parms->in.setup[i]);
        }
        smbcli_req_append_blob(req, &params_chunk);
        smbcli_req_append_blob(req, &data_chunk);

        /* add the helper which will check that all multi-part replies are
           in before an async client callack will be issued */
        req->recv_helper.fn = smb_raw_trans2_recv_helper;
        req->recv_helper.private_data = state;

        if (!smbcli_request_send(req)) {
                smbcli_request_destroy(req);
                return NULL;
        }

        return req;
}

static enum smbcli_request_state smb_raw_trans2_ship_next(struct smbcli_request *req,
                                                          struct smb_raw_trans2_recv_state *state)
{
        struct smbcli_request *req2;
        size_t space_left;
        DATA_BLOB params_chunk;
        uint16_t ofs;
        uint16_t params_ofs = 0;
        uint16_t params_disp = 0;
        DATA_BLOB data_chunk;
        uint16_t data_ofs = 0;
        uint16_t data_disp = 0;
        uint8_t wct;

        if (state->command == SMBtrans2) {
                wct = 9;
        } else {
                wct = 8;
        }

        req2 = smbcli_request_setup(req->tree, state->command+1, wct, 0);
        if (!req2) {
                goto nomem;
        }
        req2->mid = req->mid;
        SSVAL(req2->out.hdr, HDR_MID, req2->mid);

        ofs = PTR_DIFF(req2->out.data,req2->out.hdr);

        /* see how much bytes of the params block we can ship in the first request */
        space_left = raw_trans_space_left(req2);

        params_disp = state->io.in.params.length - state->params_left;
        params_chunk.length = MIN(state->params_left, space_left);
        params_chunk.data = state->io.in.params.data + params_disp;
        params_ofs = ofs;

        state->params_left -= params_chunk.length;

        /* see how much bytes of the data block we can ship in the first request */
        space_left -= params_chunk.length;

#if TORTURE_TRANS_DATA
        if (space_left > 1) {
                space_left /= 2;
        }
#endif

        data_disp = state->io.in.data.length - state->data_left;
        data_chunk.length = MIN(state->data_left, space_left);
        data_chunk.data = state->io.in.data.data + data_disp;
        data_ofs = params_ofs+params_chunk.length;

        state->data_left -= data_chunk.length;

        SSVAL(req2->out.vwv,VWV(0), state->params_total);
        SSVAL(req2->out.vwv,VWV(1), state->data_total);
        SSVAL(req2->out.vwv,VWV(2), params_chunk.length);
        SSVAL(req2->out.vwv,VWV(3), params_ofs);
        SSVAL(req2->out.vwv,VWV(4), params_disp);
        SSVAL(req2->out.vwv,VWV(5), data_chunk.length);
        SSVAL(req2->out.vwv,VWV(6), data_ofs);
        SSVAL(req2->out.vwv,VWV(7), data_disp);
        if (wct == 9) {
                SSVAL(req2->out.vwv,VWV(8), 0xFFFF);
        }

        smbcli_req_append_blob(req2, &params_chunk);
        smbcli_req_append_blob(req2, &data_chunk);

        /*
         * it's a one way request but we need
         * the seq_num, so we destroy req2 by hand
         */
        if (!smbcli_request_send(req2)) {
                goto failed;
        }

        req->seq_num = req2->seq_num;
        smbcli_request_destroy(req2);

        return SMBCLI_REQUEST_RECV;

nomem:
        req->status = NT_STATUS_NO_MEMORY;
failed:
        if (req2) {
                req->status = smbcli_request_destroy(req2);
        }
        return SMBCLI_REQUEST_ERROR;
}

static enum smbcli_request_state smb_raw_trans2_ship_rest(struct smbcli_request *req,
                                                          struct smb_raw_trans2_recv_state *state)
{
        enum smbcli_request_state ret = SMBCLI_REQUEST_ERROR;

        while (state->params_left > 0 || state->data_left > 0) {
                ret = smb_raw_trans2_ship_next(req, state);
                if (ret != SMBCLI_REQUEST_RECV) {
                        break;
                }
        }

        return ret;
}


/*
  trans/trans2 raw async interface - only BLOBs used in this interface.
  note that this doesn't yet support multi-part requests
*/
_PUBLIC_ struct smbcli_request *smb_raw_trans_send(struct smbcli_tree *tree,
                                       struct smb_trans2 *parms)
{
        return smb_raw_trans_send_backend(tree, parms, SMBtrans);
}

struct smbcli_request *smb_raw_trans2_send(struct smbcli_tree *tree,
                                       struct smb_trans2 *parms)
{
        return smb_raw_trans_send_backend(tree, parms, SMBtrans2);
}

/*
  trans2 synchronous blob interface
*/
NTSTATUS smb_raw_trans2(struct smbcli_tree *tree,
                        TALLOC_CTX *mem_ctx,
                        struct smb_trans2 *parms)
{
        struct smbcli_request *req;
        req = smb_raw_trans2_send(tree, parms);
        if (!req) return NT_STATUS_UNSUCCESSFUL;
        return smb_raw_trans2_recv(req, mem_ctx, parms);
}


/*
  trans synchronous blob interface
*/
_PUBLIC_ NTSTATUS smb_raw_trans(struct smbcli_tree *tree,
                       TALLOC_CTX *mem_ctx,
                       struct smb_trans2 *parms)
{
        struct smbcli_request *req;
        req = smb_raw_trans_send(tree, parms);
        if (!req) return NT_STATUS_UNSUCCESSFUL;
        return smb_raw_trans_recv(req, mem_ctx, parms);
}

struct smb_raw_nttrans_recv_state {
        uint32_t params_total;
        uint32_t data_total;
        uint32_t params_left;
        uint32_t data_left;
        bool got_first;
        uint32_t recvd_data;
        uint32_t recvd_param;
        struct smb_nttrans io;
};

NTSTATUS smb_raw_nttrans_recv(struct smbcli_request *req,
                              TALLOC_CTX *mem_ctx,
                              struct smb_nttrans *parms)
{
        struct smb_raw_nttrans_recv_state *state;

        if (!smbcli_request_receive(req) ||
            smbcli_request_is_error(req)) {
                goto failed;
        }

        state = talloc_get_type(req->recv_helper.private_data,
                                struct smb_raw_nttrans_recv_state);

        parms->out = state->io.out;
        talloc_steal(mem_ctx, parms->out.setup);
        talloc_steal(mem_ctx, parms->out.params.data);
        talloc_steal(mem_ctx, parms->out.data.data);
        talloc_free(state);

        ZERO_STRUCT(req->recv_helper);

failed:
        return smbcli_request_destroy(req);
}

static enum smbcli_request_state smb_raw_nttrans_ship_rest(struct smbcli_request *req,
                                                           struct smb_raw_nttrans_recv_state *state);

/*
 * This helper returns SMBCLI_REQUEST_RECV until all data has arrived
 */
static enum smbcli_request_state smb_raw_nttrans_recv_helper(struct smbcli_request *req)
{
        struct smb_raw_nttrans_recv_state *state = talloc_get_type(req->recv_helper.private_data,
                                                   struct smb_raw_nttrans_recv_state);
        uint32_t param_count, param_ofs, param_disp;
        uint32_t data_count, data_ofs, data_disp;
        uint32_t total_data, total_param;
        uint8_t setup_count;

        /*
         * An NT RPC pipe call can return ERRDOS, ERRmoredata
         * to a trans call. This is not an error and should not
         * be treated as such.
         */
        if (smbcli_request_is_error(req)) {
                goto failed;
        }

        /* sanity check */
        if (CVAL(req->in.hdr, HDR_COM) != SMBnttrans) {
                DEBUG(0,("smb_raw_nttrans_recv_helper: Expected %s response, got command 0x%02x\n",
                         "SMBnttrans", 
                         CVAL(req->in.hdr,HDR_COM)));
                req->status = NT_STATUS_INVALID_NETWORK_RESPONSE;
                goto failed;
        }

        if (state->params_left > 0 || state->data_left > 0) {
                return smb_raw_nttrans_ship_rest(req, state);
        }

        /* this is the first packet of the response */
        SMBCLI_CHECK_MIN_WCT(req, 18);

        total_param = IVAL(req->in.vwv, 3);
        total_data  = IVAL(req->in.vwv, 7);
        setup_count = CVAL(req->in.vwv, 35);

        param_count = IVAL(req->in.vwv, 11);
        param_ofs   = IVAL(req->in.vwv, 15);
        param_disp  = IVAL(req->in.vwv, 19);

        data_count = IVAL(req->in.vwv, 23);
        data_ofs   = IVAL(req->in.vwv, 27);
        data_disp  = IVAL(req->in.vwv, 31);

        if (!state->got_first) {
                if (total_param > 0) {
                        state->io.out.params = data_blob_talloc(state, NULL, total_param);
                        if (!state->io.out.params.data) {
                                goto nomem;
                        }
                }

                if (total_data > 0) {
                        state->io.out.data = data_blob_talloc(state, NULL, total_data);
                        if (!state->io.out.data.data) {
                                goto nomem;
                        }
                }

                if (setup_count > 0) {
                        SMBCLI_CHECK_WCT(req, 18 + setup_count);

                        state->io.out.setup_count = setup_count;
                        state->io.out.setup = talloc_array(state, uint8_t,
                                                           setup_count * VWV(1));
                        if (!state->io.out.setup) {
                                goto nomem;
                        }
                        memcpy(state->io.out.setup, (uint8_t *)req->out.vwv + VWV(18),
                               setup_count * VWV(1));
                }

                state->got_first = true;
        }

        if (total_data > state->io.out.data.length ||
            total_param > state->io.out.params.length) {
                /* they must *only* shrink */
                DEBUG(1,("smb_raw_nttrans_recv_helper: data/params expanded!\n"));
                req->status = NT_STATUS_BUFFER_TOO_SMALL;
                goto failed;
        }

        state->io.out.data.length = total_data;
        state->io.out.params.length = total_param;

        if (data_count + data_disp > total_data ||
            param_count + param_disp > total_param) {
                DEBUG(1,("smb_raw_nttrans_recv_helper: Buffer overflow\n"));
                req->status = NT_STATUS_BUFFER_TOO_SMALL;
                goto failed;
        }

        /* check the server isn't being nasty */
        if (raw_trans_oob(req, param_ofs, param_count) ||
            raw_trans_oob(req, data_ofs, data_count)) {
                DEBUG(1,("smb_raw_nttrans_recv_helper: out of bounds parameters!\n"));
                req->status = NT_STATUS_BUFFER_TOO_SMALL;
                goto failed;
        }

        if (data_count) {
                memcpy(state->io.out.data.data + data_disp,
                       req->in.hdr + data_ofs,
                       data_count);
        }

        if (param_count) {
                memcpy(state->io.out.params.data + param_disp,
                       req->in.hdr + param_ofs,
                       param_count);
        }

        state->recvd_param += param_count;
        state->recvd_data += data_count;

        if (state->recvd_data < total_data ||
            state->recvd_param < total_param) {

                /* we don't need the in buffer any more */
                talloc_free(req->in.buffer);
                ZERO_STRUCT(req->in);

                /* we still wait for more data */
                DEBUG(10,("smb_raw_nttrans_recv_helper: more data needed\n"));
                return SMBCLI_REQUEST_RECV;
        }

        DEBUG(10,("smb_raw_nttrans_recv_helper: done\n"));
        return SMBCLI_REQUEST_DONE;

nomem:
        req->status = NT_STATUS_NO_MEMORY;
failed:
        return SMBCLI_REQUEST_ERROR;
}

/****************************************************************************
 nttrans raw - only BLOBs used in this interface.
 at the moment we only handle a single primary request 
****************************************************************************/
struct smbcli_request *smb_raw_nttrans_send(struct smbcli_tree *tree,
                                         struct smb_nttrans *parms)
{
        struct smbcli_request *req; 
        struct smb_raw_nttrans_recv_state *state;
        uint32_t ofs;
        size_t space_left;
        DATA_BLOB params_chunk;
        uint32_t params_ofs;
        DATA_BLOB data_chunk;
        uint32_t data_ofs;
        int align = 0;

        /* only align if there are parameters or data */
        if (parms->in.params.length || parms->in.data.length) {
                align = 3;
        }
        
        req = smbcli_request_setup(tree, SMBnttrans, 
                                19 + parms->in.setup_count, align);
        if (!req) {
                return NULL;
        }

        state = talloc_zero(req, struct smb_raw_nttrans_recv_state);
        if (!state) {
                talloc_free(req);
                return NULL;
        }

        /* fill in SMB parameters */

        if (align != 0) {
                memset(req->out.data, 0, align);
        }

        ofs = PTR_DIFF(req->out.data,req->out.hdr)+align;

        /* see how much bytes of the params block we can ship in the first request */
        space_left = raw_trans_space_left(req);

        params_chunk.length = MIN(parms->in.params.length, space_left);
        params_chunk.data = parms->in.params.data;
        params_ofs = ofs;

        state->params_left = parms->in.params.length - params_chunk.length;

        if (state->params_left > 0) {
                /* we copy the whole params block, if needed we can optimize that latter */
                state->io.in.params = data_blob_talloc(state, NULL, parms->in.params.length);
                if (!state->io.in.params.data) {
                        smbcli_request_destroy(req);
                        return NULL;
                }
                memcpy(state->io.in.params.data,
                       parms->in.params.data,
                       parms->in.params.length);
        }

        /* see how much bytes of the data block we can ship in the first request */
        space_left -= params_chunk.length;

#if TORTURE_TRANS_DATA
        if (space_left > 1) {
                space_left /= 2;
        }
#endif

        data_chunk.length = MIN(parms->in.data.length, space_left);
        data_chunk.data = parms->in.data.data;
        data_ofs = params_ofs + params_chunk.length;

        state->data_left = parms->in.data.length - data_chunk.length;

        if (state->data_left > 0) {
                /* we copy the whole params block, if needed we can optimize that latter */
                state->io.in.data = data_blob_talloc(state, NULL, parms->in.data.length);
                if (!state->io.in.data.data) {
                        smbcli_request_destroy(req);
                        return NULL;
                }
                memcpy(state->io.in.data.data,
                       parms->in.data.data,
                       parms->in.data.length);
        }

        state->params_total = parms->in.params.length;
        state->data_total = parms->in.data.length;

        SCVAL(req->out.vwv,  0, parms->in.max_setup);
        SSVAL(req->out.vwv,  1, 0); /* reserved */
        SIVAL(req->out.vwv,  3, parms->in.params.length);
        SIVAL(req->out.vwv,  7, parms->in.data.length);
        SIVAL(req->out.vwv, 11, parms->in.max_param);
        SIVAL(req->out.vwv, 15, parms->in.max_data);
        SIVAL(req->out.vwv, 19, params_chunk.length);
        SIVAL(req->out.vwv, 23, params_ofs);
        SIVAL(req->out.vwv, 27, data_chunk.length);
        SIVAL(req->out.vwv, 31, data_ofs);
        SCVAL(req->out.vwv, 35, parms->in.setup_count);
        SSVAL(req->out.vwv, 36, parms->in.function);
        memcpy(req->out.vwv + VWV(19), parms->in.setup,
               sizeof(uint16_t) * parms->in.setup_count);

        smbcli_req_append_blob(req, &params_chunk);
        smbcli_req_append_blob(req, &data_chunk);

        /* add the helper which will check that all multi-part replies are
           in before an async client callack will be issued */
        req->recv_helper.fn = smb_raw_nttrans_recv_helper;
        req->recv_helper.private_data = state;

        if (!smbcli_request_send(req)) {
                smbcli_request_destroy(req);
                return NULL;
        }

        return req;
}

static enum smbcli_request_state smb_raw_nttrans_ship_next(struct smbcli_request *req,
                                                           struct smb_raw_nttrans_recv_state *state)
{
        struct smbcli_request *req2;
        size_t space_left;
        DATA_BLOB params_chunk;
        uint32_t ofs;
        uint32_t params_ofs = 0;
        uint32_t params_disp = 0;
        DATA_BLOB data_chunk;
        uint32_t data_ofs = 0;
        uint32_t data_disp = 0;

        req2 = smbcli_request_setup(req->tree, SMBnttranss, 18, 0);
        if (!req2) {
                goto nomem;
        }
        req2->mid = req->mid;
        SSVAL(req2->out.hdr, HDR_MID, req2->mid);

        ofs = PTR_DIFF(req2->out.data,req2->out.hdr);

        /* see how much bytes of the params block we can ship in the first request */
        space_left = raw_trans_space_left(req2);

        params_disp = state->io.in.params.length - state->params_left;
        params_chunk.length = MIN(state->params_left, space_left);
        params_chunk.data = state->io.in.params.data + params_disp;
        params_ofs = ofs;

        state->params_left -= params_chunk.length;

        /* see how much bytes of the data block we can ship in the first request */
        space_left -= params_chunk.length;

#if TORTURE_TRANS_DATA
        if (space_left > 1) {
                space_left /= 2;
        }
#endif

        data_disp = state->io.in.data.length - state->data_left;
        data_chunk.length = MIN(state->data_left, space_left);
        data_chunk.data = state->io.in.data.data + data_disp;
        data_ofs = params_ofs+params_chunk.length;

        state->data_left -= data_chunk.length;

        SSVAL(req2->out.vwv,0, 0); /* reserved */
        SCVAL(req2->out.vwv,2, 0); /* reserved */
        SIVAL(req2->out.vwv,3, state->params_total);
        SIVAL(req2->out.vwv,7, state->data_total);
        SIVAL(req2->out.vwv,11, params_chunk.length);
        SIVAL(req2->out.vwv,15, params_ofs);
        SIVAL(req2->out.vwv,19, params_disp);
        SIVAL(req2->out.vwv,23, data_chunk.length);
        SIVAL(req2->out.vwv,27, data_ofs);
        SIVAL(req2->out.vwv,31, data_disp);
        SCVAL(req2->out.vwv,35, 0); /* reserved */

        smbcli_req_append_blob(req2, &params_chunk);
        smbcli_req_append_blob(req2, &data_chunk);

        /*
         * it's a one way request but we need
         * the seq_num, so we destroy req2 by hand
         */
        if (!smbcli_request_send(req2)) {
                goto failed;
        }

        req->seq_num = req2->seq_num;
        smbcli_request_destroy(req2);

        return SMBCLI_REQUEST_RECV;

nomem:
        req->status = NT_STATUS_NO_MEMORY;
failed:
        if (req2) {
                req->status = smbcli_request_destroy(req2);
        }
        return SMBCLI_REQUEST_ERROR;
}

static enum smbcli_request_state smb_raw_nttrans_ship_rest(struct smbcli_request *req,
                                                           struct smb_raw_nttrans_recv_state *state)
{
        enum smbcli_request_state ret = SMBCLI_REQUEST_ERROR;

        while (state->params_left > 0 || state->data_left > 0) {
                ret = smb_raw_nttrans_ship_next(req, state);
                if (ret != SMBCLI_REQUEST_RECV) {
                        break;
                }
        }

        return ret;
}


/****************************************************************************
  receive a SMB nttrans response allocating the necessary memory
  ****************************************************************************/
NTSTATUS smb_raw_nttrans(struct smbcli_tree *tree,
                         TALLOC_CTX *mem_ctx,
                         struct smb_nttrans *parms)
{
        struct smbcli_request *req;

        req = smb_raw_nttrans_send(tree, parms);
        if (!req) {
                return NT_STATUS_UNSUCCESSFUL;
        }

        return smb_raw_nttrans_recv(req, mem_ctx, parms);
}