s3: Explicitly handle inbuf in cli_read_andx_done
[samba.git] / source3 / libsmb / clireadwrite.c
index e2d5337ee44c44a5c25279c548bc75d82278afed..aa6be3a57ac652f339ef88a3e54546c0825f17ca 100644 (file)
@@ -1,18 +1,18 @@
-/* 
+/*
    Unix SMB/CIFS implementation.
    client file read/write routines
    Copyright (C) Andrew Tridgell 1994-1998
-   
+
    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"
 
 /****************************************************************************
-Issue a single SMBread and don't wait for a reply.
+  Calculate the recommended read buffer size
 ****************************************************************************/
+static size_t cli_read_max_bufsize(struct cli_state *cli)
+{
+       if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
+           && (cli->posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
+               return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
+       }
+       if (cli->capabilities & CAP_LARGE_READX) {
+               return cli->is_samba
+                       ? CLI_SAMBA_MAX_LARGE_READX_SIZE
+                       : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
+       }
+       return (cli->max_xmit - (smb_size+32)) & ~1023;
+}
 
-static bool cli_issue_read(struct cli_state *cli, int fnum, off_t offset, 
-                          size_t size, int i)
+/****************************************************************************
+  Calculate the recommended write buffer size
+****************************************************************************/
+static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
 {
-       bool bigoffset = False;
+        if (write_mode == 0 &&
+           !client_is_signing_on(cli) &&
+           !cli_encryption_on(cli) &&
+           (cli->posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
+           (cli->capabilities & CAP_LARGE_FILES)) {
+               /* Only do massive writes if we can do them direct
+                * with no signing or encrypting - not on a pipe. */
+               return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
+       }
 
-       memset(cli->outbuf,'\0',smb_size);
-       memset(cli->inbuf,'\0',smb_size);
+       if (cli->is_samba) {
+               return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
+       }
 
-       if ((SMB_BIG_UINT)offset >> 32) 
-               bigoffset = True;
+       if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
+           || client_is_signing_on(cli)
+           || strequal(cli->dev, "LPT1:")) {
 
-       set_message(cli->outbuf,bigoffset ? 12 : 10,0,True);
-               
-       SCVAL(cli->outbuf,smb_com,SMBreadX);
-       SSVAL(cli->outbuf,smb_tid,cli->cnum);
-       cli_setup_packet(cli);
+               /*
+                * Printer devices are restricted to max_xmit writesize in
+                * Vista and XPSP3 as are signing connections.
+                */
 
-       SCVAL(cli->outbuf,smb_vwv0,0xFF);
-       SSVAL(cli->outbuf,smb_vwv2,fnum);
-       SIVAL(cli->outbuf,smb_vwv3,offset);
-       SSVAL(cli->outbuf,smb_vwv5,size);
-       SSVAL(cli->outbuf,smb_vwv6,size);
-       SSVAL(cli->outbuf,smb_vwv7,(size >> 16));
-       SSVAL(cli->outbuf,smb_mid,cli->mid + i);
+               return (cli->max_xmit - (smb_size+32)) & ~1023;
+       }
 
-       if (bigoffset) {
-               SIVAL(cli->outbuf,smb_vwv10,(((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
+       return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
+}
+
+struct cli_read_andx_state {
+       size_t size;
+       uint16_t vwv[12];
+       NTSTATUS status;
+       size_t received;
+       uint8_t *buf;
+};
+
+static void cli_read_andx_done(struct tevent_req *subreq);
+
+struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
+                                       struct event_context *ev,
+                                       struct cli_state *cli, uint16_t fnum,
+                                       off_t offset, size_t size,
+                                       struct tevent_req **psmbreq)
+{
+       struct tevent_req *req, *subreq;
+       struct cli_read_andx_state *state;
+       uint8_t wct = 10;
+
+       if (size > cli_read_max_bufsize(cli)) {
+               DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
+                         "size=%d\n", (int)size,
+                         (int)cli_read_max_bufsize(cli)));
+               return NULL;
        }
 
-       return cli_send_smb(cli);
+       req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
+       if (req == NULL) {
+               return NULL;
+       }
+       state->size = size;
+
+       SCVAL(state->vwv + 0, 0, 0xFF);
+       SCVAL(state->vwv + 0, 1, 0);
+       SSVAL(state->vwv + 1, 0, 0);
+       SSVAL(state->vwv + 2, 0, fnum);
+       SIVAL(state->vwv + 3, 0, offset);
+       SSVAL(state->vwv + 5, 0, size);
+       SSVAL(state->vwv + 6, 0, size);
+       SSVAL(state->vwv + 7, 0, (size >> 16));
+       SSVAL(state->vwv + 8, 0, 0);
+       SSVAL(state->vwv + 9, 0, 0);
+
+       if ((uint64_t)offset >> 32) {
+               SIVAL(state->vwv + 10, 0,
+                     (((uint64_t)offset)>>32) & 0xffffffff);
+               wct += 2;
+       }
+
+       subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
+                                   state->vwv, 0, NULL);
+       if (subreq == NULL) {
+               TALLOC_FREE(req);
+               return NULL;
+       }
+       tevent_req_set_callback(subreq, cli_read_andx_done, req);
+       *psmbreq = subreq;
+       return req;
 }
 
-/****************************************************************************
-  Read size bytes at offset offset using SMBreadX.
-****************************************************************************/
+struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
+                                     struct event_context *ev,
+                                     struct cli_state *cli, uint16_t fnum,
+                                     off_t offset, size_t size)
+{
+       struct tevent_req *req, *subreq;
+       NTSTATUS status;
+
+       req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
+                                  &subreq);
+       if (req == NULL) {
+               return NULL;
+       }
 
-ssize_t cli_read(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
+       status = cli_smb_req_send(subreq);
+       if (!NT_STATUS_IS_OK(status)) {
+               tevent_req_nterror(req, status);
+               return tevent_req_post(req, ev);
+       }
+       return req;
+}
+
+static void cli_read_andx_done(struct tevent_req *subreq)
 {
-       char *p;
-       size_t size2;
-       size_t readsize;
-       ssize_t total = 0;
-       /* We can only do direct reads if not signing. */
-       bool direct_reads = !client_is_signing_on(cli);
+       struct tevent_req *req = tevent_req_callback_data(
+               subreq, struct tevent_req);
+       struct cli_read_andx_state *state = tevent_req_data(
+               req, struct cli_read_andx_state);
+       uint8_t *inbuf;
+       uint8_t wct;
+       uint16_t *vwv;
+       uint32_t num_bytes;
+       uint8_t *bytes;
+
+       state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
+                                    &num_bytes, &bytes);
+       TALLOC_FREE(subreq);
+       if (NT_STATUS_IS_ERR(state->status)) {
+               tevent_req_nterror(req, state->status);
+               return;
+       }
 
-       if (size == 0) 
-               return 0;
+       /* size is the number of bytes the server returned.
+        * Might be zero. */
+       state->received = SVAL(vwv + 5, 0);
+       state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
+
+       if (state->received > state->size) {
+               DEBUG(5,("server returned more than we wanted!\n"));
+               tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
+               return;
+       }
 
        /*
-        * Set readsize to the maximum size we can handle in one readX,
-        * rounded down to a multiple of 1024.
+        * bcc field must be valid for small reads, for large reads the 16-bit
+        * bcc field can't be correct.
         */
 
-       if (client_is_signing_on(cli) == False && (cli->posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
-               readsize = CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
-       } else if (cli->capabilities & CAP_LARGE_READX) {
-               if (cli->is_samba) {
-                       readsize = CLI_SAMBA_MAX_LARGE_READX_SIZE;
-               } else {
-                       readsize = CLI_WINDOWS_MAX_LARGE_READX_SIZE;
-               }
-       } else {
-               readsize = (cli->max_xmit - (smb_size+32)) & ~1023;
+       if ((state->received < 0xffff) && (state->received > num_bytes)) {
+               DEBUG(5, ("server announced more bytes than sent\n"));
+               tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+               return;
        }
 
-       while (total < size) {
-               readsize = MIN(readsize, size-total);
+       state->buf = (uint8_t *)smb_base(inbuf) + SVAL(vwv+6, 0);
 
-               /* Issue a read and receive a reply */
+       if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
+           || ((state->received != 0) && (state->buf < bytes))) {
+               DEBUG(5, ("server returned invalid read&x data offset\n"));
+               tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+               return;
+       }
+       tevent_req_done(req);
+}
 
-               if (!cli_issue_read(cli, fnum, offset, readsize, 0))
-                       return -1;
+/*
+ * Pull the data out of a finished async read_and_x request. rcvbuf is
+ * talloced from the request, so better make sure that you copy it away before
+ * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
+ * talloc_move it!
+ */
 
-               if (direct_reads) {
-                       if (!cli_receive_smb_readX_header(cli))
-                               return -1;
-               } else {
-                       if (!cli_receive_smb(cli))
-                               return -1;
-               }
+NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
+                           uint8_t **rcvbuf)
+{
+       struct cli_read_andx_state *state = tevent_req_data(
+               req, struct cli_read_andx_state);
+       NTSTATUS status;
 
-               /* Check for error.  Make sure to check for DOS and NT
-                   errors. */
+       if (tevent_req_is_nterror(req, &status)) {
+               return status;
+       }
+       *received = state->received;
+       *rcvbuf = state->buf;
+       return NT_STATUS_OK;
+}
 
-                if (cli_is_error(cli)) {
-                       bool recoverable_error = False;
-                        NTSTATUS status = NT_STATUS_OK;
-                        uint8 eclass = 0;
-                       uint32 ecode = 0;
+struct cli_readall_state {
+       struct tevent_context *ev;
+       struct cli_state *cli;
+       uint16_t fnum;
+       off_t start_offset;
+       size_t size;
+       size_t received;
+       uint8_t *buf;
+};
+
+static void cli_readall_done(struct tevent_req *subreq);
+
+static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
+                                          struct event_context *ev,
+                                          struct cli_state *cli,
+                                          uint16_t fnum,
+                                          off_t offset, size_t size)
+{
+       struct tevent_req *req, *subreq;
+       struct cli_readall_state *state;
 
-                        if (cli_is_nt_error(cli))
-                                status = cli_nt_error(cli);
-                        else
-                                cli_dos_error(cli, &eclass, &ecode);
+       req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
+       if (req == NULL) {
+               return NULL;
+       }
+       state->ev = ev;
+       state->cli = cli;
+       state->fnum = fnum;
+       state->start_offset = offset;
+       state->size = size;
+       state->received = 0;
+       state->buf = NULL;
+
+       subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
+       if (tevent_req_nomem(subreq, req)) {
+               return tevent_req_post(req, ev);
+       }
+       tevent_req_set_callback(subreq, cli_readall_done, req);
+       return req;
+}
 
-                       /*
-                        * ERRDOS ERRmoredata or STATUS_MORE_ENRTIES is a
-                        * recoverable error, plus we have valid data in the
-                        * packet so don't error out here.
-                        */
+static void cli_readall_done(struct tevent_req *subreq)
+{
+       struct tevent_req *req = tevent_req_callback_data(
+               subreq, struct tevent_req);
+       struct cli_readall_state *state = tevent_req_data(
+               req, struct cli_readall_state);
+       ssize_t received;
+       uint8_t *buf;
+       NTSTATUS status;
+
+       status = cli_read_andx_recv(subreq, &received, &buf);
+       if (!NT_STATUS_IS_OK(status)) {
+               tevent_req_nterror(req, status);
+               return;
+       }
 
-                        if ((eclass == ERRDOS && ecode == ERRmoredata) ||
-                            NT_STATUS_V(status) == NT_STATUS_V(STATUS_MORE_ENTRIES))
-                               recoverable_error = True;
+       if (received == 0) {
+               /* EOF */
+               tevent_req_done(req);
+               return;
+       }
 
-                       if (!recoverable_error)
-                                return -1;
-               }
+       if ((state->received == 0) && (received == state->size)) {
+               /* Ideal case: Got it all in one run */
+               state->buf = buf;
+               state->received += received;
+               tevent_req_done(req);
+               return;
+       }
 
-               size2 = SVAL(cli->inbuf, smb_vwv5);
-               size2 |= (((unsigned int)(SVAL(cli->inbuf, smb_vwv7))) << 16);
+       /*
+        * We got a short read, issue a read for the
+        * rest. Unfortunately we have to allocate the buffer
+        * ourselves now, as our caller expects to receive a single
+        * buffer. cli_read_andx does it from the buffer received from
+        * the net, but with a short read we have to put it together
+        * from several reads.
+        */
 
-               if (size2 > readsize) {
-                       DEBUG(5,("server returned more than we wanted!\n"));
-                       return -1;
-               } else if (size2 < 0) {
-                       DEBUG(5,("read return < 0!\n"));
-                       return -1;
+       if (state->buf == NULL) {
+               state->buf = talloc_array(state, uint8_t, state->size);
+               if (tevent_req_nomem(state->buf, req)) {
+                       return;
                }
+       }
+       memcpy(state->buf + state->received, buf, received);
+       state->received += received;
 
-               if (!direct_reads) {
-                       /* Copy data into buffer */
-                       p = smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_vwv6);
-                       memcpy(buf + total, p, size2);
-               } else {
-                       /* Ensure the remaining data matches the return size. */
-                       ssize_t toread = smb_len_large(cli->inbuf) - SVAL(cli->inbuf,smb_vwv6);
-
-                       /* Ensure the size is correct. */
-                       if (toread != size2) {
-                               DEBUG(5,("direct read logic fail toread (%d) != size2 (%u)\n",
-                                       (int)toread, (unsigned int)size2 ));
-                               return -1;
-                       }
+       TALLOC_FREE(subreq);
 
-                       /* Read data directly into buffer */
-                       toread = cli_receive_smb_data(cli,buf+total,size2);
-                       if (toread != size2) {
-                               DEBUG(5,("direct read read failure toread (%d) != size2 (%u)\n",
-                                       (int)toread, (unsigned int)size2 ));
-                               return -1;
-                       }
-               }
+       if (state->received >= state->size) {
+               tevent_req_done(req);
+               return;
+       }
 
-               total += size2;
-               offset += size2;
+       subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
+                                   state->start_offset + state->received,
+                                   state->size - state->received);
+       if (tevent_req_nomem(subreq, req)) {
+               return;
+       }
+       tevent_req_set_callback(subreq, cli_readall_done, req);
+}
 
-               /*
-                * If the server returned less than we asked for we're at EOF.
-                */
+static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
+                                uint8_t **rcvbuf)
+{
+       struct cli_readall_state *state = tevent_req_data(
+               req, struct cli_readall_state);
+       NTSTATUS status;
 
-               if (size2 < readsize)
-                       break;
+       if (tevent_req_is_nterror(req, &status)) {
+               return status;
        }
-
-       return total;
+       *received = state->received;
+       *rcvbuf = state->buf;
+       return NT_STATUS_OK;
 }
 
-#if 0  /* relies on client_receive_smb(), now a static in libsmb/clientgen.c */
+struct cli_pull_subreq {
+       struct tevent_req *req;
+       ssize_t received;
+       uint8_t *buf;
+};
 
-/* This call is INCOMPATIBLE with SMB signing.  If you remove the #if 0
-   you must fix ensure you don't attempt to sign the packets - data
-   *will* be currupted */
+/*
+ * Parallel read support.
+ *
+ * cli_pull sends as many read&x requests as the server would allow via
+ * max_mux at a time. When replies flow back in, the data is written into
+ * the callback function "sink" in the right order.
+ */
 
-/****************************************************************************
-Issue a single SMBreadraw and don't wait for a reply.
-****************************************************************************/
+struct cli_pull_state {
+       struct tevent_req *req;
+
+       struct event_context *ev;
+       struct cli_state *cli;
+       uint16_t fnum;
+       off_t start_offset;
+       SMB_OFF_T size;
+
+       NTSTATUS (*sink)(char *buf, size_t n, void *priv);
+       void *priv;
+
+       size_t chunk_size;
+
+       /*
+        * Outstanding requests
+        */
+       int num_reqs;
+       struct cli_pull_subreq *reqs;
+
+       /*
+        * For how many bytes did we send requests already?
+        */
+       SMB_OFF_T requested;
 
-static bool cli_issue_readraw(struct cli_state *cli, int fnum, off_t offset, 
-                          size_t size, int i)
+       /*
+        * Next request index to push into "sink". This walks around the "req"
+        * array, taking care that the requests are pushed to "sink" in the
+        * right order. If necessary (i.e. replies don't come in in the right
+        * order), replies are held back in "reqs".
+        */
+       int top_req;
+
+       /*
+        * How many bytes did we push into "sink"?
+        */
+
+       SMB_OFF_T pushed;
+};
+
+static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 {
+       struct cli_pull_state *state = tevent_req_data(
+               req, struct cli_pull_state);
+       char *result;
 
-       if (!cli->sign_info.use_smb_signing) {
-               DEBUG(0, ("Cannot use readraw and SMB Signing\n"));
-               return False;
+       result = tevent_req_print(mem_ctx, req);
+       if (result == NULL) {
+               return NULL;
        }
-       
-       memset(cli->outbuf,'\0',smb_size);
-       memset(cli->inbuf,'\0',smb_size);
 
-       set_message(cli->outbuf,10,0,True);
-               
-       SCVAL(cli->outbuf,smb_com,SMBreadbraw);
-       SSVAL(cli->outbuf,smb_tid,cli->cnum);
-       cli_setup_packet(cli);
+       return talloc_asprintf_append_buffer(
+               result, "num_reqs=%d, top_req=%d",
+               state->num_reqs, state->top_req);
+}
 
-       SSVAL(cli->outbuf,smb_vwv0,fnum);
-       SIVAL(cli->outbuf,smb_vwv1,offset);
-       SSVAL(cli->outbuf,smb_vwv2,size);
-       SSVAL(cli->outbuf,smb_vwv3,size);
-       SSVAL(cli->outbuf,smb_mid,cli->mid + i);
+static void cli_pull_read_done(struct tevent_req *read_req);
+
+/*
+ * Prepare an async pull request
+ */
+
+struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
+                                struct event_context *ev,
+                                struct cli_state *cli,
+                                uint16_t fnum, off_t start_offset,
+                                SMB_OFF_T size, size_t window_size,
+                                NTSTATUS (*sink)(char *buf, size_t n,
+                                                 void *priv),
+                                void *priv)
+{
+       struct tevent_req *req;
+       struct cli_pull_state *state;
+       int i;
+
+       req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
+       if (req == NULL) {
+               return NULL;
+       }
+       tevent_req_set_print_fn(req, cli_pull_print);
+       state->req = req;
+
+       state->cli = cli;
+       state->ev = ev;
+       state->fnum = fnum;
+       state->start_offset = start_offset;
+       state->size = size;
+       state->sink = sink;
+       state->priv = priv;
+
+       state->pushed = 0;
+       state->top_req = 0;
+
+       if (size == 0) {
+               tevent_req_done(req);
+               return tevent_req_post(req, ev);
+       }
+
+       state->chunk_size = cli_read_max_bufsize(cli);
+
+       state->num_reqs = MAX(window_size/state->chunk_size, 1);
+       state->num_reqs = MIN(state->num_reqs, cli->max_mux);
+
+       state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
+                                       state->num_reqs);
+       if (state->reqs == NULL) {
+               goto failed;
+       }
+
+       state->requested = 0;
 
-       return cli_send_smb(cli);
+       for (i=0; i<state->num_reqs; i++) {
+               struct cli_pull_subreq *subreq = &state->reqs[i];
+               SMB_OFF_T size_left;
+               size_t request_thistime;
+
+               if (state->requested >= size) {
+                       state->num_reqs = i;
+                       break;
+               }
+
+               size_left = size - state->requested;
+               request_thistime = MIN(size_left, state->chunk_size);
+
+               subreq->req = cli_readall_send(
+                       state->reqs, ev, cli, fnum,
+                       state->start_offset + state->requested,
+                       request_thistime);
+
+               if (subreq->req == NULL) {
+                       goto failed;
+               }
+               tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
+               state->requested += request_thistime;
+       }
+       return req;
+
+failed:
+       TALLOC_FREE(req);
+       return NULL;
 }
 
-/****************************************************************************
- Tester for the readraw call.
-****************************************************************************/
+/*
+ * Handle incoming read replies, push the data into sink and send out new
+ * requests if necessary.
+ */
 
-ssize_t cli_readraw(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
+static void cli_pull_read_done(struct tevent_req *subreq)
 {
-       char *p;
-       int size2;
-       size_t readsize;
-       ssize_t total = 0;
+       struct tevent_req *req = tevent_req_callback_data(
+               subreq, struct tevent_req);
+       struct cli_pull_state *state = tevent_req_data(
+               req, struct cli_pull_state);
+       struct cli_pull_subreq *pull_subreq = NULL;
+       NTSTATUS status;
+       int i;
+
+       for (i = 0; i < state->num_reqs; i++) {
+               pull_subreq = &state->reqs[i];
+               if (subreq == pull_subreq->req) {
+                       break;
+               }
+       }
+       if (i == state->num_reqs) {
+               /* Huh -- received something we did not send?? */
+               tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
+               return;
+       }
 
-       if (size == 0) 
-               return 0;
+       status = cli_readall_recv(subreq, &pull_subreq->received,
+                                 &pull_subreq->buf);
+       if (!NT_STATUS_IS_OK(status)) {
+               tevent_req_nterror(state->req, status);
+               return;
+       }
 
        /*
-        * Set readsize to the maximum size we can handle in one readraw.
+        * This loop is the one to take care of out-of-order replies. All
+        * pending requests are in state->reqs, state->reqs[top_req] is the
+        * one that is to be pushed next. If however a request later than
+        * top_req is replied to, then we can't push yet. If top_req is
+        * replied to at a later point then, we need to push all the finished
+        * requests.
         */
 
-       readsize = 0xFFFF;
-
-       while (total < size) {
-               readsize = MIN(readsize, size-total);
+       while (state->reqs[state->top_req].req != NULL) {
+               struct cli_pull_subreq *top_subreq;
 
-               /* Issue a read and receive a reply */
+               DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
+                          state->top_req));
 
-               if (!cli_issue_readraw(cli, fnum, offset, readsize, 0))
-                       return -1;
+               top_subreq = &state->reqs[state->top_req];
 
-               if (!client_receive_smb(cli->fd, cli->inbuf, cli->timeout))
-                       return -1;
+               if (tevent_req_is_in_progress(top_subreq->req)) {
+                       DEBUG(11, ("cli_pull_read_done: top request not yet "
+                                  "done\n"));
+                       return;
+               }
 
-               size2 = smb_len(cli->inbuf);
+               DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
+                          "pushed\n", (int)top_subreq->received,
+                          (int)state->pushed));
 
-               if (size2 > readsize) {
-                       DEBUG(5,("server returned more than we wanted!\n"));
-                       return -1;
-               } else if (size2 < 0) {
-                       DEBUG(5,("read return < 0!\n"));
-                       return -1;
+               status = state->sink((char *)top_subreq->buf,
+                                    top_subreq->received, state->priv);
+               if (!NT_STATUS_IS_OK(status)) {
+                       tevent_req_nterror(state->req, status);
+                       return;
                }
+               state->pushed += top_subreq->received;
 
-               /* Copy data into buffer */
+               TALLOC_FREE(state->reqs[state->top_req].req);
 
-               if (size2) {
-                       p = cli->inbuf + 4;
-                       memcpy(buf + total, p, size2);
+               if (state->requested < state->size) {
+                       struct tevent_req *new_req;
+                       SMB_OFF_T size_left;
+                       size_t request_thistime;
+
+                       size_left = state->size - state->requested;
+                       request_thistime = MIN(size_left, state->chunk_size);
+
+                       DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
+                                  "at %d, position %d\n",
+                                  (int)request_thistime,
+                                  (int)(state->start_offset
+                                        + state->requested),
+                                  state->top_req));
+
+                       new_req = cli_readall_send(
+                               state->reqs, state->ev, state->cli,
+                               state->fnum,
+                               state->start_offset + state->requested,
+                               request_thistime);
+
+                       if (tevent_req_nomem(new_req, state->req)) {
+                               return;
+                       }
+                       tevent_req_set_callback(new_req, cli_pull_read_done,
+                                               req);
+
+                       state->reqs[state->top_req].req = new_req;
+                       state->requested += request_thistime;
                }
 
-               total += size2;
-               offset += size2;
+               state->top_req = (state->top_req+1) % state->num_reqs;
+       }
+
+       tevent_req_done(req);
+}
+
+NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
+{
+       struct cli_pull_state *state = tevent_req_data(
+               req, struct cli_pull_state);
+       NTSTATUS status;
+
+       if (tevent_req_is_nterror(req, &status)) {
+               return status;
+       }
+       *received = state->pushed;
+       return NT_STATUS_OK;
+}
+
+NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
+                 off_t start_offset, SMB_OFF_T size, size_t window_size,
+                 NTSTATUS (*sink)(char *buf, size_t n, void *priv),
+                 void *priv, SMB_OFF_T *received)
+{
+       TALLOC_CTX *frame = talloc_stackframe();
+       struct event_context *ev;
+       struct tevent_req *req;
+       NTSTATUS status = NT_STATUS_OK;
 
+       if (cli_has_async_calls(cli)) {
                /*
-                * If the server returned less than we asked for we're at EOF.
+                * Can't use sync call while an async call is in flight
                 */
+               status = NT_STATUS_INVALID_PARAMETER;
+               goto fail;
+       }
 
-               if (size2 < readsize)
-                       break;
+       ev = event_context_init(frame);
+       if (ev == NULL) {
+               status = NT_STATUS_NO_MEMORY;
+               goto fail;
        }
 
-       return total;
+       req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
+                           window_size, sink, priv);
+       if (req == NULL) {
+               status = NT_STATUS_NO_MEMORY;
+               goto fail;
+       }
+
+       if (!tevent_req_poll(req, ev)) {
+               status = map_nt_error_from_unix(errno);
+               goto fail;
+       }
+
+       status = cli_pull_recv(req, received);
+ fail:
+       TALLOC_FREE(frame);
+       if (!NT_STATUS_IS_OK(status)) {
+               cli_set_error(cli, status);
+       }
+       return status;
 }
-#endif
+
+static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
+{
+       char **pbuf = (char **)priv;
+       memcpy(*pbuf, buf, n);
+       *pbuf += n;
+       return NT_STATUS_OK;
+}
+
+ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
+                off_t offset, size_t size)
+{
+       NTSTATUS status;
+       SMB_OFF_T ret;
+
+       status = cli_pull(cli, fnum, offset, size, size,
+                         cli_read_sink, &buf, &ret);
+       if (!NT_STATUS_IS_OK(status)) {
+               cli_set_error(cli, status);
+               return -1;
+       }
+       return ret;
+}
+
 /****************************************************************************
-issue a single SMBwrite and don't wait for a reply
+ Issue a single SMBwrite and don't wait for a reply.
 ****************************************************************************/
 
-static bool cli_issue_write(struct cli_state *cli, int fnum, off_t offset, 
-                           uint16 mode, const char *buf,
-                           size_t size, int i)
+static bool cli_issue_write(struct cli_state *cli,
+                               uint16_t fnum,
+                               off_t offset,
+                               uint16 mode,
+                               const char *buf,
+                               size_t size,
+                               int i)
 {
        char *p;
-       bool large_writex = False;
+       bool large_writex = false;
+       /* We can only do direct writes if not signing and not encrypting. */
+       bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
 
-       if (size + 1 > cli->bufsize) {
+       if (!direct_writes && size + 1 > cli->bufsize) {
                cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
                if (!cli->outbuf) {
                        return False;
@@ -311,10 +730,11 @@ static bool cli_issue_write(struct cli_state *cli, int fnum, off_t offset,
                large_writex = True;
        }
 
-       if (large_writex)
-               set_message(cli->outbuf,14,0,True);
-       else
-               set_message(cli->outbuf,12,0,True);
+       if (large_writex) {
+               cli_set_message(cli->outbuf,14,0,True);
+       } else {
+               cli_set_message(cli->outbuf,12,0,True);
+       }
 
        SCVAL(cli->outbuf,smb_com,SMBwriteX);
        SSVAL(cli->outbuf,smb_tid,cli->cnum);
@@ -334,25 +754,39 @@ static bool cli_issue_write(struct cli_state *cli, int fnum, off_t offset,
         * locally. However, this check might already have been
         * done by our callers.
         */
-       SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
+       SSVAL(cli->outbuf,smb_vwv9,(size>>16));
        SSVAL(cli->outbuf,smb_vwv10,size);
        /* +1 is pad byte. */
        SSVAL(cli->outbuf,smb_vwv11,
              smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
 
        if (large_writex) {
-               SIVAL(cli->outbuf,smb_vwv12,(((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
+               SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
        }
 
        p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
        *p++ = '\0'; /* pad byte. */
-       memcpy(p, buf, size);
-       cli_setup_bcc(cli, p+size);
+       if (!direct_writes) {
+               memcpy(p, buf, size);
+       }
+       if (size > 0x1FFFF) {
+               /* This is a POSIX 14 word large write. */
+               set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
+               _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
+       } else {
+               cli_setup_bcc(cli, p+size);
+       }
 
        SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 
        show_msg(cli->outbuf);
-       return cli_send_smb(cli);
+       if (direct_writes) {
+               /* For direct writes we now need to write the data
+                * directly out of buf. */
+               return cli_send_smb_direct_writeX(cli, buf, size);
+       } else {
+               return cli_send_smb(cli);
+       }
 }
 
 /****************************************************************************
@@ -364,15 +798,15 @@ static bool cli_issue_write(struct cli_state *cli, int fnum, off_t offset,
 ****************************************************************************/
 
 ssize_t cli_write(struct cli_state *cli,
-                int fnum, uint16 write_mode,
+                uint16_t fnum, uint16 write_mode,
                 const char *buf, off_t offset, size_t size)
 {
        ssize_t bwritten = 0;
        unsigned int issued = 0;
        unsigned int received = 0;
        int mpx = 1;
-       int block = cli->max_xmit - (smb_size+32);
-       int blocks = (size + (block-1)) / block;
+       size_t writesize;
+       int blocks;
 
        if(cli->max_mux > 1) {
                mpx = cli->max_mux-1;
@@ -380,11 +814,15 @@ ssize_t cli_write(struct cli_state *cli,
                mpx = 1;
        }
 
+       writesize = cli_write_max_bufsize(cli, write_mode);
+
+       blocks = (size + (writesize-1)) / writesize;
+
        while (received < blocks) {
 
                while ((issued - received < mpx) && (issued < blocks)) {
-                       ssize_t bsent = issued * block;
-                       ssize_t size1 = MIN(block, size - bsent);
+                       ssize_t bsent = issued * writesize;
+                       ssize_t size1 = MIN(writesize, size - bsent);
 
                        if (!cli_issue_write(cli, fnum, offset + bsent,
                                        write_mode,
@@ -394,8 +832,9 @@ ssize_t cli_write(struct cli_state *cli,
                        issued++;
                }
 
-               if (!cli_receive_smb(cli))
+               if (!cli_receive_smb(cli)) {
                        return bwritten;
+               }
 
                received++;
 
@@ -403,12 +842,15 @@ ssize_t cli_write(struct cli_state *cli,
                        break;
 
                bwritten += SVAL(cli->inbuf, smb_vwv2);
-               bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
+               if (writesize > 0xFFFF) {
+                       bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
+               }
        }
 
-       while (received < issued && cli_receive_smb(cli))
+       while (received < issued && cli_receive_smb(cli)) {
                received++;
-       
+       }
+
        return bwritten;
 }
 
@@ -417,41 +859,41 @@ ssize_t cli_write(struct cli_state *cli,
 ****************************************************************************/
 
 ssize_t cli_smbwrite(struct cli_state *cli,
-                    int fnum, char *buf, off_t offset, size_t size1)
+                    uint16_t fnum, char *buf, off_t offset, size_t size1)
 {
        char *p;
        ssize_t total = 0;
 
        do {
                size_t size = MIN(size1, cli->max_xmit - 48);
-               
+
                memset(cli->outbuf,'\0',smb_size);
                memset(cli->inbuf,'\0',smb_size);
 
-               set_message(cli->outbuf,5, 0,True);
+               cli_set_message(cli->outbuf,5, 0,True);
 
                SCVAL(cli->outbuf,smb_com,SMBwrite);
                SSVAL(cli->outbuf,smb_tid,cli->cnum);
                cli_setup_packet(cli);
-               
+
                SSVAL(cli->outbuf,smb_vwv0,fnum);
                SSVAL(cli->outbuf,smb_vwv1,size);
                SIVAL(cli->outbuf,smb_vwv2,offset);
                SSVAL(cli->outbuf,smb_vwv4,0);
-               
+
                p = smb_buf(cli->outbuf);
                *p++ = 1;
                SSVAL(p, 0, size); p += 2;
                memcpy(p, buf + total, size); p += size;
 
                cli_setup_bcc(cli, p);
-               
+
                if (!cli_send_smb(cli))
                        return -1;
 
                if (!cli_receive_smb(cli))
                        return -1;
-               
+
                if (cli_is_error(cli))
                        return -1;
 
@@ -467,3 +909,462 @@ ssize_t cli_smbwrite(struct cli_state *cli,
 
        return total;
 }
+
+/*
+ * Send a write&x request
+ */
+
+struct cli_write_andx_state {
+       size_t size;
+       uint16_t vwv[14];
+       size_t written;
+       uint8_t pad;
+       struct iovec iov[2];
+};
+
+static void cli_write_andx_done(struct tevent_req *subreq);
+
+struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
+                                        struct event_context *ev,
+                                        struct cli_state *cli, uint16_t fnum,
+                                        uint16_t mode, const uint8_t *buf,
+                                        off_t offset, size_t size,
+                                        struct tevent_req **reqs_before,
+                                        int num_reqs_before,
+                                        struct tevent_req **psmbreq)
+{
+       struct tevent_req *req, *subreq;
+       struct cli_write_andx_state *state;
+       bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
+       uint8_t wct = bigoffset ? 14 : 12;
+       size_t max_write = cli_write_max_bufsize(cli, mode);
+       uint16_t *vwv;
+
+       req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
+       if (req == NULL) {
+               return NULL;
+       }
+
+       size = MIN(size, max_write);
+
+       vwv = state->vwv;
+
+       SCVAL(vwv+0, 0, 0xFF);
+       SCVAL(vwv+0, 1, 0);
+       SSVAL(vwv+1, 0, 0);
+       SSVAL(vwv+2, 0, fnum);
+       SIVAL(vwv+3, 0, offset);
+       SIVAL(vwv+5, 0, 0);
+       SSVAL(vwv+7, 0, mode);
+       SSVAL(vwv+8, 0, 0);
+       SSVAL(vwv+9, 0, (size>>16));
+       SSVAL(vwv+10, 0, size);
+
+       SSVAL(vwv+11, 0,
+             cli_smb_wct_ofs(reqs_before, num_reqs_before)
+             + 1               /* the wct field */
+             + wct * 2         /* vwv */
+             + 2               /* num_bytes field */
+             + 1               /* pad */);
+
+       if (bigoffset) {
+               SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
+       }
+
+       state->pad = 0;
+       state->iov[0].iov_base = (void *)&state->pad;
+       state->iov[0].iov_len = 1;
+       state->iov[1].iov_base = CONST_DISCARD(void *, buf);
+       state->iov[1].iov_len = size;
+
+       subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
+                                   2, state->iov);
+       if (tevent_req_nomem(subreq, req)) {
+               return tevent_req_post(req, ev);
+       }
+       tevent_req_set_callback(subreq, cli_write_andx_done, req);
+       *psmbreq = subreq;
+       return req;
+}
+
+struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
+                                      struct event_context *ev,
+                                      struct cli_state *cli, uint16_t fnum,
+                                      uint16_t mode, const uint8_t *buf,
+                                      off_t offset, size_t size)
+{
+       struct tevent_req *req, *subreq;
+       NTSTATUS status;
+
+       req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
+                                   size, NULL, 0, &subreq);
+       if (req == NULL) {
+               return NULL;
+       }
+
+       status = cli_smb_req_send(subreq);
+       if (!NT_STATUS_IS_OK(status)) {
+               tevent_req_nterror(req, status);
+               return tevent_req_post(req, ev);
+       }
+       return req;
+}
+
+static void cli_write_andx_done(struct tevent_req *subreq)
+{
+       struct tevent_req *req = tevent_req_callback_data(
+               subreq, struct tevent_req);
+       struct cli_write_andx_state *state = tevent_req_data(
+               req, struct cli_write_andx_state);
+       uint8_t wct;
+       uint16_t *vwv;
+       NTSTATUS status;
+
+       status = cli_smb_recv(subreq, NULL, NULL, 6, &wct, &vwv, NULL, NULL);
+       if (NT_STATUS_IS_ERR(status)) {
+               TALLOC_FREE(subreq);
+               tevent_req_nterror(req, status);
+               return;
+       }
+       state->written = SVAL(vwv+2, 0);
+       state->written |= SVAL(vwv+4, 0)<<16;
+       tevent_req_done(req);
+}
+
+NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
+{
+       struct cli_write_andx_state *state = tevent_req_data(
+               req, struct cli_write_andx_state);
+       NTSTATUS status;
+
+       if (tevent_req_is_nterror(req, &status)) {
+               return status;
+       }
+       *pwritten = state->written;
+       return NT_STATUS_OK;
+}
+
+struct cli_writeall_state {
+       struct event_context *ev;
+       struct cli_state *cli;
+       uint16_t fnum;
+       uint16_t mode;
+       const uint8_t *buf;
+       off_t offset;
+       size_t size;
+       size_t written;
+};
+
+static void cli_writeall_written(struct tevent_req *req);
+
+static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
+                                           struct event_context *ev,
+                                           struct cli_state *cli,
+                                           uint16_t fnum,
+                                           uint16_t mode,
+                                           const uint8_t *buf,
+                                           off_t offset, size_t size)
+{
+       struct tevent_req *req, *subreq;
+       struct cli_writeall_state *state;
+
+       req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
+       if (req == NULL) {
+               return NULL;
+       }
+       state->ev = ev;
+       state->cli = cli;
+       state->fnum = fnum;
+       state->mode = mode;
+       state->buf = buf;
+       state->offset = offset;
+       state->size = size;
+       state->written = 0;
+
+       subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
+                                    state->mode, state->buf, state->offset,
+                                    state->size);
+       if (tevent_req_nomem(subreq, req)) {
+               return tevent_req_post(req, ev);
+       }
+       tevent_req_set_callback(subreq, cli_writeall_written, req);
+       return req;
+}
+
+static void cli_writeall_written(struct tevent_req *subreq)
+{
+       struct tevent_req *req = tevent_req_callback_data(
+               subreq, struct tevent_req);
+       struct cli_writeall_state *state = tevent_req_data(
+               req, struct cli_writeall_state);
+       NTSTATUS status;
+       size_t written, to_write;
+
+       status = cli_write_andx_recv(subreq, &written);
+       TALLOC_FREE(subreq);
+       if (!NT_STATUS_IS_OK(status)) {
+               tevent_req_nterror(req, status);
+               return;
+       }
+
+       state->written += written;
+
+       if (state->written > state->size) {
+               tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+               return;
+       }
+
+       to_write = state->size - state->written;
+
+       if (to_write == 0) {
+               tevent_req_done(req);
+               return;
+       }
+
+       subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
+                                    state->mode,
+                                    state->buf + state->written,
+                                    state->offset + state->written, to_write);
+       if (tevent_req_nomem(subreq, req)) {
+               return;
+       }
+       tevent_req_set_callback(subreq, cli_writeall_written, req);
+}
+
+static NTSTATUS cli_writeall_recv(struct tevent_req *req)
+{
+       return tevent_req_simple_recv_ntstatus(req);
+}
+
+struct cli_push_write_state {
+       struct tevent_req *req;/* This is the main request! Not the subreq */
+       uint32_t idx;
+       off_t ofs;
+       uint8_t *buf;
+       size_t size;
+};
+
+struct cli_push_state {
+       struct event_context *ev;
+       struct cli_state *cli;
+       uint16_t fnum;
+       uint16_t mode;
+       off_t start_offset;
+       size_t window_size;
+
+       size_t (*source)(uint8_t *buf, size_t n, void *priv);
+       void *priv;
+
+       bool eof;
+
+       size_t chunk_size;
+       off_t next_offset;
+
+       /*
+        * Outstanding requests
+        */
+       uint32_t pending;
+       uint32_t num_reqs;
+       struct cli_push_write_state **reqs;
+};
+
+static void cli_push_written(struct tevent_req *req);
+
+static bool cli_push_write_setup(struct tevent_req *req,
+                                struct cli_push_state *state,
+                                uint32_t idx)
+{
+       struct cli_push_write_state *substate;
+       struct tevent_req *subreq;
+
+       substate = talloc(state->reqs, struct cli_push_write_state);
+       if (!substate) {
+               return false;
+       }
+       substate->req = req;
+       substate->idx = idx;
+       substate->ofs = state->next_offset;
+       substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
+       if (!substate->buf) {
+               talloc_free(substate);
+               return false;
+       }
+       substate->size = state->source(substate->buf,
+                                      state->chunk_size,
+                                      state->priv);
+       if (substate->size == 0) {
+               state->eof = true;
+               /* nothing to send */
+               talloc_free(substate);
+               return true;
+       }
+
+       subreq = cli_writeall_send(substate,
+                                  state->ev, state->cli,
+                                  state->fnum, state->mode,
+                                  substate->buf,
+                                  substate->ofs,
+                                  substate->size);
+       if (!subreq) {
+               talloc_free(substate);
+               return false;
+       }
+       tevent_req_set_callback(subreq, cli_push_written, substate);
+
+       state->reqs[idx] = substate;
+       state->pending += 1;
+       state->next_offset += substate->size;
+
+       return true;
+}
+
+struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
+                                struct cli_state *cli,
+                                uint16_t fnum, uint16_t mode,
+                                off_t start_offset, size_t window_size,
+                                size_t (*source)(uint8_t *buf, size_t n,
+                                                 void *priv),
+                                void *priv)
+{
+       struct tevent_req *req;
+       struct cli_push_state *state;
+       uint32_t i;
+
+       req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
+       if (req == NULL) {
+               return NULL;
+       }
+       state->cli = cli;
+       state->ev = ev;
+       state->fnum = fnum;
+       state->start_offset = start_offset;
+       state->mode = mode;
+       state->source = source;
+       state->priv = priv;
+       state->eof = false;
+       state->pending = 0;
+       state->next_offset = start_offset;
+
+       state->chunk_size = cli_write_max_bufsize(cli, mode);
+
+       if (window_size == 0) {
+               window_size = cli->max_mux * state->chunk_size;
+       }
+       state->num_reqs = window_size/state->chunk_size;
+       if ((window_size % state->chunk_size) > 0) {
+               state->num_reqs += 1;
+       }
+       state->num_reqs = MIN(state->num_reqs, cli->max_mux);
+       state->num_reqs = MAX(state->num_reqs, 1);
+
+       state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
+                                       state->num_reqs);
+       if (state->reqs == NULL) {
+               goto failed;
+       }
+
+       for (i=0; i<state->num_reqs; i++) {
+               if (!cli_push_write_setup(req, state, i)) {
+                       goto failed;
+               }
+
+               if (state->eof) {
+                       break;
+               }
+       }
+
+       if (state->pending == 0) {
+               tevent_req_done(req);
+               return tevent_req_post(req, ev);
+       }
+
+       return req;
+
+ failed:
+       tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
+       return tevent_req_post(req, ev);
+}
+
+static void cli_push_written(struct tevent_req *subreq)
+{
+       struct cli_push_write_state *substate = tevent_req_callback_data(
+               subreq, struct cli_push_write_state);
+       struct tevent_req *req = substate->req;
+       struct cli_push_state *state = tevent_req_data(
+               req, struct cli_push_state);
+       NTSTATUS status;
+       uint32_t idx = substate->idx;
+
+       state->reqs[idx] = NULL;
+       state->pending -= 1;
+
+       status = cli_writeall_recv(subreq);
+       TALLOC_FREE(subreq);
+       TALLOC_FREE(substate);
+       if (!NT_STATUS_IS_OK(status)) {
+               tevent_req_nterror(req, status);
+               return;
+       }
+
+       if (!state->eof) {
+               if (!cli_push_write_setup(req, state, idx)) {
+                       tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
+                       return;
+               }
+       }
+
+       if (state->pending == 0) {
+               tevent_req_done(req);
+               return;
+       }
+}
+
+NTSTATUS cli_push_recv(struct tevent_req *req)
+{
+       return tevent_req_simple_recv_ntstatus(req);
+}
+
+NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
+                 off_t start_offset, size_t window_size,
+                 size_t (*source)(uint8_t *buf, size_t n, void *priv),
+                 void *priv)
+{
+       TALLOC_CTX *frame = talloc_stackframe();
+       struct event_context *ev;
+       struct tevent_req *req;
+       NTSTATUS status = NT_STATUS_OK;
+
+       if (cli_has_async_calls(cli)) {
+               /*
+                * Can't use sync call while an async call is in flight
+                */
+               status = NT_STATUS_INVALID_PARAMETER;
+               goto fail;
+       }
+
+       ev = event_context_init(frame);
+       if (ev == NULL) {
+               status = NT_STATUS_NO_MEMORY;
+               goto fail;
+       }
+
+       req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
+                           window_size, source, priv);
+       if (req == NULL) {
+               status = NT_STATUS_NO_MEMORY;
+               goto fail;
+       }
+
+       if (!tevent_req_poll(req, ev)) {
+               status = map_nt_error_from_unix(errno);
+               goto fail;
+       }
+
+       status = cli_push_recv(req);
+ fail:
+       TALLOC_FREE(frame);
+       if (!NT_STATUS_IS_OK(status)) {
+               cli_set_error(cli, status);
+       }
+       return status;
+}