Add async trans/trans2/nttrans calls to libsmb

Logic stolen from Samba4, naturally the specific implementation differs a bit.
(This used to be commit 4b8bc5b03d35d563104791c0d8317d9886e4f032)

2 files changed, 722 insertions, 0 deletions

diff --git a/source3/include/proto.h b/source3/include/proto.h
index d51be6781d..2901911c70 100644
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -4732,6 +4732,27 @@ bool cli_send_nt_trans(struct cli_state *cli,
 bool cli_receive_nt_trans(struct cli_state *cli,
 			  char **param, unsigned int *param_len,
 			  char **data, unsigned int *data_len);
+struct async_req *cli_trans_send(
+	TALLOC_CTX *mem_ctx, struct event_context *ev,
+	struct cli_state *cli, uint8_t trans_cmd,
+	const char *pipe_name, uint16_t fid, uint16_t function, int flags,
+	uint16_t *setup, uint8_t num_setup, uint8_t max_setup,
+	uint8_t *param, uint32_t num_param, uint32_t max_param,
+	uint8_t *data, uint32_t num_data, uint32_t max_data);
+NTSTATUS cli_trans_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
+			uint16_t **setup, uint8_t *num_setup,
+			uint8_t **param, uint32_t *num_param,
+			uint8_t **data, uint32_t *num_data);
+NTSTATUS cli_trans(TALLOC_CTX *mem_ctx, struct cli_state *cli,
+		   uint8_t trans_cmd,
+		   const char *pipe_name, uint16_t fid, uint16_t function,
+		   int flags,
+		   uint16_t *setup, uint8_t num_setup, uint8_t max_setup,
+		   uint8_t *param, uint32_t num_param, uint32_t max_param,
+		   uint8_t *data, uint32_t num_data, uint32_t max_data,
+		   uint16_t **rsetup, uint8_t *num_rsetup,
+		   uint8_t **rparam, uint32_t *num_rparam,
+		   uint8_t **rdata, uint32_t *num_rdata);
 
 /* The following definitions come from libsmb/conncache.c  */
 
diff --git a/source3/libsmb/clitrans.c b/source3/libsmb/clitrans.c
index 4bb70f1a08..5b84e68fc4 100644
--- a/source3/libsmb/clitrans.c
+++ b/source3/libsmb/clitrans.c
@@ -701,3 +701,704 @@ bool cli_receive_nt_trans(struct cli_state *cli,
 	client_set_trans_sign_state_off(cli, SVAL(cli->inbuf,smb_mid));
 	return ret;
 }
+
+struct trans_recvblob {
+	uint8_t *data;
+	uint32_t max, total, received;
+};
+
+struct cli_trans_state {
+	struct cli_state *cli;
+	struct event_context *ev;
+	uint8_t cmd;
+	uint16_t mid;
+	const char *pipe_name;
+	uint16_t fid;
+	uint16_t function;
+	int flags;
+	uint16_t *setup;
+	uint8_t num_setup, max_setup;
+	uint8_t *param;
+	uint32_t num_param, param_sent;
+	uint8_t *data;
+	uint32_t num_data, data_sent;
+
+	uint8_t num_rsetup;
+	uint16_t *rsetup;
+	struct trans_recvblob rparam;
+	struct trans_recvblob rdata;
+
+	TALLOC_CTX *secondary_request_ctx;
+};
+
+static void cli_trans_recv_helper(struct async_req *req);
+
+static struct async_req *cli_ship_trans(TALLOC_CTX *mem_ctx,
+					struct cli_trans_state *state)
+{
+	TALLOC_CTX *frame;
+	struct async_req *result = NULL;
+	struct cli_request *cli_req;
+	uint8_t wct;
+	uint16_t *vwv;
+	uint8_t *bytes = NULL;
+	uint16_t param_offset;
+	uint16_t this_param = 0;
+	uint16_t this_data = 0;
+	uint32_t useable_space;
+	uint8_t cmd;
+
+	frame = talloc_stackframe();
+
+	cmd = state->cmd;
+
+	if ((state->param_sent != 0) || (state->data_sent != 0)) {
+		/* The secondary commands are one after the primary ones */
+		cmd += 1;
+	}
+
+	param_offset = smb_size - 4;
+
+	switch (cmd) {
+	case SMBtrans:
+		bytes = TALLOC_ZERO_P(talloc_tos(), uint8_t); /* padding */
+		if (bytes == NULL) {
+			goto fail;
+		}
+		bytes = smb_bytes_push_str(
+			bytes, (state->cli->capabilities & CAP_UNICODE) != 0,
+			state->pipe_name);
+		if (bytes == NULL) {
+			goto fail;
+		}
+		wct = 14 + state->num_setup;
+		param_offset += talloc_get_size(bytes);
+		break;
+	case SMBtrans2:
+		bytes = TALLOC_ARRAY(talloc_tos(), uint8_t, 3); /* padding */
+		if (bytes == NULL) {
+			goto fail;
+		}
+		bytes[0] = 0;
+		bytes[1] = 'D';	/* Copy this from "old" 3.0 behaviour */
+		bytes[2] = ' ';
+		wct = 14 + state->num_setup;
+		param_offset += talloc_get_size(bytes);
+		break;
+	case SMBtranss:
+		wct = 8;
+		break;
+	case SMBtranss2:
+		wct = 9;
+		break;
+	case SMBnttrans:
+		wct = 19 + state->num_setup;
+		break;
+	case SMBnttranss:
+		wct = 18;
+		break;
+	default:
+		goto fail;
+	}
+
+	useable_space = state->cli->max_xmit - smb_size - sizeof(uint16_t)*wct;
+
+	if (state->param_sent < state->num_param) {
+		this_param = MIN(state->num_param - state->param_sent,
+				 useable_space);
+	}
+
+	if (state->data_sent < state->num_data) {
+		this_data = MIN(state->num_data - state->data_sent,
+				useable_space - this_param);
+	}
+
+	vwv = TALLOC_ARRAY(talloc_tos(), uint16_t, wct);
+	if (vwv == NULL) {
+		goto fail;
+	}
+	param_offset += wct * sizeof(uint16_t);
+
+	DEBUG(10, ("num_setup=%u, max_setup=%u, "
+		   "param_total=%u, this_param=%u, max_param=%u, "
+		   "data_total=%u, this_data=%u, max_data=%u, "
+		   "param_offset=%u, param_disp=%u, data_disp=%u\n",
+		   (unsigned)state->num_setup, (unsigned)state->max_setup,
+		   (unsigned)state->num_param, (unsigned)this_param,
+		   (unsigned)state->rparam.max,
+		   (unsigned)state->num_data, (unsigned)this_data,
+		   (unsigned)state->rdata.max,
+		   (unsigned)param_offset,
+		   (unsigned)state->param_sent, (unsigned)state->data_sent));
+
+	switch (cmd) {
+	case SMBtrans:
+	case SMBtrans2:
+		SSVAL(vwv + 0, 0, state->num_param);
+		SSVAL(vwv + 1, 0, state->num_data);
+		SSVAL(vwv + 2, 0, state->rparam.max);
+		SSVAL(vwv + 3, 0, state->rdata.max);
+		SCVAL(vwv + 4, 0, state->max_setup);
+		SCVAL(vwv + 4, 1, 0);	/* reserved */
+		SSVAL(vwv + 5, 0, state->flags);
+		SIVAL(vwv + 6, 0, 0);	/* timeout */
+		SSVAL(vwv + 8, 0, 0);	/* reserved */
+		SSVAL(vwv + 9, 0, this_param);
+		SSVAL(vwv +10, 0, param_offset);
+		SSVAL(vwv +11, 0, this_data);
+		SSVAL(vwv +12, 0, param_offset + this_param);
+		SCVAL(vwv +13, 0, state->num_setup);
+		SCVAL(vwv +13, 1, 0);	/* reserved */
+		memcpy(vwv + 14, state->setup,
+		       sizeof(uint16_t) * state->num_setup);
+		break;
+	case SMBtranss:
+	case SMBtranss2:
+		SSVAL(vwv + 0, 0, state->num_param);
+		SSVAL(vwv + 1, 0, state->num_data);
+		SSVAL(vwv + 2, 0, this_param);
+		SSVAL(vwv + 3, 0, param_offset);
+		SSVAL(vwv + 4, 0, state->param_sent);
+		SSVAL(vwv + 5, 0, this_data);
+		SSVAL(vwv + 6, 0, param_offset + this_param);
+		SSVAL(vwv + 7, 0, state->data_sent);
+		if (cmd == SMBtranss2) {
+			SSVAL(vwv + 8, 0, state->fid);
+		}
+		break;
+	case SMBnttrans:
+		SCVAL(vwv,  0, state->max_setup);
+		SSVAL(vwv,  1, 0); /* reserved */
+		SIVAL(vwv,  3, state->num_param);
+		SIVAL(vwv,  7, state->num_data);
+		SIVAL(vwv, 11, state->rparam.max);
+		SIVAL(vwv, 15, state->rdata.max);
+		SIVAL(vwv, 19, this_param);
+		SIVAL(vwv, 23, param_offset);
+		SIVAL(vwv, 27, this_data);
+		SIVAL(vwv, 31, param_offset + this_param);
+		SCVAL(vwv, 35, state->num_setup);
+		SSVAL(vwv, 36, state->function);
+		memcpy(vwv + 19, state->setup,
+		       sizeof(uint16_t) * state->num_setup);
+		break;
+	case SMBnttranss:
+		SSVAL(vwv,  0, 0); /* reserved */
+		SCVAL(vwv,  2, 0); /* reserved */
+		SIVAL(vwv,  3, state->num_param);
+		SIVAL(vwv,  7, state->num_data);
+		SIVAL(vwv, 11, this_param);
+		SIVAL(vwv, 15, param_offset);
+		SIVAL(vwv, 19, state->param_sent);
+		SIVAL(vwv, 23, this_data);
+		SIVAL(vwv, 27, param_offset + this_param);
+		SIVAL(vwv, 31, state->data_sent);
+		SCVAL(vwv, 35, 0); /* reserved */
+		break;
+	}
+
+	bytes = (uint8_t *)talloc_append_blob(
+		talloc_tos(), bytes,
+		data_blob_const(state->param + state->param_sent, this_param));
+	if (bytes == NULL) {
+		goto fail;
+	}
+	state->param_sent += this_param;
+
+	bytes = (uint8_t *)talloc_append_blob(
+		talloc_tos(), bytes,
+		data_blob_const(state->data + state->data_sent,	this_data));
+	if (bytes == NULL) {
+		goto fail;
+	}
+	state->data_sent += this_data;
+
+	if ((cmd == SMBtrans) || (cmd == SMBtrans2) || (cmd == SMBnttrans)) {
+		/*
+		 * Primary request, retrieve our mid
+		 */
+		result = cli_request_send(mem_ctx, state->ev, state->cli,
+					  cmd, 0, wct, vwv,
+					  talloc_get_size(bytes), bytes);
+		if (result == NULL) {
+			goto fail;
+		}
+		cli_req = talloc_get_type_abort(result->private_data,
+						struct cli_request);
+		state->mid = cli_req->mid;
+	} else {
+		uint16_t num_bytes = talloc_get_size(bytes);
+		/*
+		 * Secondary request, we have to fix up the mid. Thus we do
+		 * the chain_cork/chain/uncork ourselves.
+		 */
+		if (!cli_chain_cork(state->cli, state->ev,
+				    wct * sizeof(uint16_t) + num_bytes + 3)) {
+			goto fail;
+		}
+		result = cli_request_send(mem_ctx, state->ev, state->cli,
+					  cmd, 0, wct, vwv, num_bytes, bytes);
+		if (result == NULL) {
+			goto fail;
+		}
+		cli_req = talloc_get_type_abort(result->private_data,
+						struct cli_request);
+		cli_req->recv_helper.fn = cli_trans_recv_helper;
+		cli_req->recv_helper.priv = state;
+		cli_req->mid = state->mid;
+		client_set_trans_sign_state_off(state->cli, state->mid);
+		cli_chain_uncork(state->cli);
+	}
+
+	client_set_trans_sign_state_on(state->cli, state->mid);
+
+ fail:
+	TALLOC_FREE(frame);
+	return result;
+}
+
+static void cli_trans_ship_rest(struct async_req *req,
+				struct cli_trans_state *state)
+{
+	state->secondary_request_ctx = talloc_new(state);
+	if (state->secondary_request_ctx == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+
+	while ((state->param_sent < state->num_param)
+	       || (state->data_sent < state->num_data)) {
+		struct async_req *cli_req;
+
+		cli_req = cli_ship_trans(state->secondary_request_ctx, state);
+		if (cli_req == NULL) {
+			async_req_error(req, NT_STATUS_NO_MEMORY);
+			return;
+		}
+	}
+}
+
+static bool cli_trans_oob(uint32_t bufsize, uint32_t offset, uint32_t length)
+{
+	if ((offset + length < offset) || (offset + length < length)) {
+		/* wrap */
+		return true;
+	}
+	if ((offset > bufsize) || (offset + length > bufsize)) {
+		/* overflow */
+		return true;
+	}
+	return false;
+}
+
+static NTSTATUS cli_pull_trans(struct async_req *req,
+			       struct cli_request *cli_req,
+			       uint8_t smb_cmd, bool expect_first_reply,
+			       uint8_t *pnum_setup, uint16_t **psetup,
+			       uint32_t *ptotal_param, uint32_t *pnum_param,
+			       uint32_t *pparam_disp, uint8_t **pparam,
+			       uint32_t *ptotal_data, uint32_t *pnum_data,
+			       uint32_t *pdata_disp, uint8_t **pdata)
+{
+	uint32_t param_ofs, data_ofs;
+	uint8_t wct;
+	uint16_t *vwv;
+	uint16_t num_bytes;
+	uint8_t *bytes;
+	NTSTATUS status;
+
+	status = cli_pull_reply(req, &wct, &vwv, &num_bytes, &bytes);
+
+	/*
+	 * We can receive something like STATUS_MORE_ENTRIES, so don't use
+	 * !NT_STATUS_IS_OK(status) here.
+	 */
+
+	if (NT_STATUS_IS_ERR(status)) {
+		return status;
+	}
+
+	if (expect_first_reply) {
+		if ((wct != 0) || (num_bytes != 0)) {
+			return NT_STATUS_INVALID_NETWORK_RESPONSE;
+		}
+		return NT_STATUS_OK;
+	}
+
+	switch (smb_cmd) {
+	case SMBtrans:
+	case SMBtrans2:
+		if (wct < 10) {
+			return NT_STATUS_INVALID_NETWORK_RESPONSE;
+		}
+		*ptotal_param	= SVAL(vwv + 0, 0);
+		*ptotal_data	= SVAL(vwv + 1, 0);
+		*pnum_param	= SVAL(vwv + 3, 0);
+		param_ofs	= SVAL(vwv + 4, 0);
+		*pparam_disp	= SVAL(vwv + 5, 0);
+		*pnum_data	= SVAL(vwv + 6, 0);
+		data_ofs	= SVAL(vwv + 7, 0);
+		*pdata_disp	= SVAL(vwv + 8, 0);
+		*pnum_setup	= CVAL(vwv + 9, 0);
+		if (wct < 10 + (*pnum_setup)) {
+			return NT_STATUS_INVALID_NETWORK_RESPONSE;
+		}
+		*psetup = vwv + 10;
+
+		break;
+	case SMBnttrans:
+		if (wct < 18) {
+			return NT_STATUS_INVALID_NETWORK_RESPONSE;
+		}
+		*ptotal_param	= IVAL(vwv, 3);
+		*ptotal_data	= IVAL(vwv, 7);
+		*pnum_param	= IVAL(vwv, 11);
+		param_ofs	= IVAL(vwv, 15);
+		*pparam_disp	= IVAL(vwv, 19);
+		*pnum_data	= IVAL(vwv, 23);
+		data_ofs	= IVAL(vwv, 27);
+		*pdata_disp	= IVAL(vwv, 31);
+		*pnum_setup	= CVAL(vwv, 35);
+		*psetup		= vwv + 18;
+		break;
+
+	default:
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	/*
+	 * Check for buffer overflows. data_ofs needs to be checked against
+	 * the incoming buffer length, data_disp against the total
+	 * length. Likewise for param_ofs/param_disp.
+	 */
+
+	if (cli_trans_oob(smb_len(cli_req->inbuf), param_ofs, *pnum_param)
+	    || cli_trans_oob(*ptotal_param, *pparam_disp, *pnum_param)
+	    || cli_trans_oob(smb_len(cli_req->inbuf), data_ofs, *pnum_data)
+	    || cli_trans_oob(*ptotal_data, *pdata_disp, *pnum_data)) {
+		return NT_STATUS_INVALID_NETWORK_RESPONSE;
+	}
+
+	*pparam = (uint8_t *)cli_req->inbuf + 4 + param_ofs;
+	*pdata = (uint8_t *)cli_req->inbuf + 4 + data_ofs;
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS cli_trans_pull_blob(TALLOC_CTX *mem_ctx,
+				    struct trans_recvblob *blob,
+				    uint32_t total, uint32_t thistime,
+				    uint8_t *buf, uint32_t displacement)
+{
+	if (blob->data == NULL) {
+		if (total > blob->max) {
+			return NT_STATUS_INVALID_NETWORK_RESPONSE;
+		}
+		blob->total = total;
+		blob->data = TALLOC_ARRAY(mem_ctx, uint8_t, total);
+		if (blob->data == NULL) {
+			return NT_STATUS_NO_MEMORY;
+		}
+	}
+
+	if (total > blob->total) {
+		return NT_STATUS_INVALID_NETWORK_RESPONSE;
+	}
+
+	if (thistime) {
+		memcpy(blob->data + displacement, buf, thistime);
+		blob->received += thistime;
+	}
+
+	return NT_STATUS_OK;
+}
+
+static void cli_trans_recv_helper(struct async_req *req)
+{
+	struct cli_request *cli_req = talloc_get_type_abort(
+		req->private_data, struct cli_request);
+	struct cli_trans_state *state = talloc_get_type_abort(
+		cli_req->recv_helper.priv, struct cli_trans_state);
+	uint8_t num_setup;
+	uint16_t *setup;
+	uint32_t total_param, num_param, param_disp;
+	uint32_t total_data, num_data, data_disp;
+	uint8_t *param, *data;
+	bool sent_all;
+	NTSTATUS status;
+
+	sent_all = (state->param_sent == state->num_param)
+		&& (state->data_sent == state->num_data);
+
+	status = cli_pull_trans(
+		req, cli_req, state->cmd, !sent_all, &num_setup, &setup,
+		&total_param, &num_param, &param_disp, &param,
+		&total_data, &num_data, &data_disp, &data);
+
+	/*
+	 * We can receive something like STATUS_MORE_ENTRIES, so don't use
+	 * !NT_STATUS_IS_OK(status) here.
+	 */
+
+	if (NT_STATUS_IS_ERR(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	if (!sent_all) {
+		cli_trans_ship_rest(req, state);
+		return;
+	}
+
+	/*
+	 * We've just received a real response. This means that we don't need
+	 * the secondary cli_request structures anymore, they have all been
+	 * shipped to the server.
+	 */
+	TALLOC_FREE(state->secondary_request_ctx);
+
+	if (num_setup != 0) {
+		TALLOC_FREE(state->rsetup);
+		state->rsetup = (uint16_t *)TALLOC_MEMDUP(
+			state, setup, sizeof(uint16_t) * num_setup);
+		if (state->rsetup == NULL) {
+			async_req_error(req, NT_STATUS_NO_MEMORY);
+			return;
+		}
+	}
+
+	status = cli_trans_pull_blob(
+		state, &state->rparam, total_param, num_param, param,
+		param_disp);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("Pulling params failed: %s\n", nt_errstr(status)));
+		async_req_error(req, status);
+		return;
+	}
+
+	status = cli_trans_pull_blob(
+		state, &state->rdata, total_data, num_data, data,
+		data_disp);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("Pulling data failed: %s\n", nt_errstr(status)));
+		async_req_error(req, status);
+		return;
+	}
+
+	if ((state->rparam.total == state->rparam.received)
+	    && (state->rdata.total == state->rdata.received)) {
+		client_set_trans_sign_state_off(state->cli, state->mid);
+		async_req_done(req);
+	}
+}
+
+struct async_req *cli_trans_send(
+	TALLOC_CTX *mem_ctx, struct event_context *ev,
+	struct cli_state *cli, uint8_t trans_cmd,
+	const char *pipe_name, uint16_t fid, uint16_t function, int flags,
+	uint16_t *setup, uint8_t num_setup, uint8_t max_setup,
+	uint8_t *param, uint32_t num_param, uint32_t max_param,
+	uint8_t *data, uint32_t num_data, uint32_t max_data)
+{
+	struct async_req *req;
+	struct cli_request *cli_req;
+	struct cli_trans_state *state;
+
+	/*
+	 * We can't use it in a chained request chain, we'd get the offset
+	 * calculations wrong.
+	 */
+
+	if (cli_in_chain(cli)) {
+		return NULL;
+	}
+
+	if ((trans_cmd == SMBtrans) || (trans_cmd == SMBtrans2)) {
+		if ((num_param > 0xffff) || (max_param > 0xffff)
+		    || (num_data > 0xffff) || (max_data > 0xffff)) {
+			DEBUG(3, ("Attempt to send invalid trans2 request "
+				  "(setup %u, params %u/%u, data %u/%u)\n",
+				  (unsigned)num_setup,
+				  (unsigned)num_param, (unsigned)max_param,
+				  (unsigned)num_data, (unsigned)max_data));
+			return NULL;
+		}
+	}
+
+	state = talloc(mem_ctx, struct cli_trans_state);
+	if (state == NULL) {
+		goto nomem;
+	}
+
+	state->cli = cli;
+	state->ev = ev;
+	state->cmd = trans_cmd;
+	state->num_rsetup = 0;
+	state->rsetup = NULL;
+	ZERO_STRUCT(state->rparam);
+	ZERO_STRUCT(state->rdata);
+	state->secondary_request_ctx = NULL;
+
+	if (trans_cmd == SMBtrans) {
+		state->pipe_name = talloc_strdup(state, pipe_name);
+		if (state->pipe_name == NULL) {
+			goto nomem;
+		}
+	}
+	if (trans_cmd == SMBtrans2) {
+		state->fid = fid;
+	}
+	if (trans_cmd == SMBnttrans) {
+		state->function = function;
+	}
+
+	state->flags = flags;
+
+	if (setup != NULL) {
+		state->setup = (uint16_t *)TALLOC_MEMDUP(
+			state, setup, sizeof(*setup) * num_setup);
+		if (state->setup == NULL) {
+			goto nomem;
+		}
+		state->num_setup = num_setup;
+	} else {
+		state->setup = NULL;
+		state->num_setup = 0;
+	}
+
+	state->max_setup = max_setup;
+
+	if (param != NULL) {
+		state->param = (uint8_t *)TALLOC_MEMDUP(state, param,
+							num_param);
+		if (state->param == NULL) {
+			goto nomem;
+		}
+		state->num_param = num_param;
+	} else {
+		state->param = NULL;
+		state->num_param = 0;
+	}
+
+	state->param_sent = 0;
+	state->rparam.max = max_param;
+
+	if (data != NULL) {
+		state->data = (uint8_t *)TALLOC_MEMDUP(state, data, num_data);
+		if (state->data == NULL) {
+			goto nomem;
+		}
+		state->num_data = num_data;
+	} else {
+		state->data = NULL;
+		state->num_data = 0;
+	}
+
+	state->data_sent = 0;
+	state->rdata.max = max_data;
+
+	req = cli_ship_trans(state, state);
+	if (req == NULL) {
+		goto nomem;
+	}
+
+	cli_req = talloc_get_type_abort(req->private_data, struct cli_request);
+	cli_req->recv_helper.fn = cli_trans_recv_helper;
+	cli_req->recv_helper.priv = state;
+
+	return req;
+
+ nomem:
+	TALLOC_FREE(state);
+	return NULL;
+}
+
+NTSTATUS cli_trans_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
+			uint16_t **setup, uint8_t *num_setup,
+			uint8_t **param, uint32_t *num_param,
+			uint8_t **data, uint32_t *num_data)
+{
+	struct cli_request *cli_req = talloc_get_type_abort(
+		req->private_data, struct cli_request);
+	struct cli_trans_state *state = talloc_get_type_abort(
+		cli_req->recv_helper.priv, struct cli_trans_state);
+
+	SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
+	if (req->state == ASYNC_REQ_ERROR) {
+		return req->status;
+	}
+
+	if (setup != NULL) {
+		*setup = talloc_move(mem_ctx, &state->rsetup);
+		*num_setup = state->num_rsetup;
+	} else {
+		TALLOC_FREE(state->rsetup);
+	}
+
+	if (param != NULL) {
+		*param = talloc_move(mem_ctx, &state->rparam.data);
+		*num_param = state->rparam.total;
+	} else {
+		TALLOC_FREE(state->rparam.data);
+	}
+
+	if (data != NULL) {
+		*data = talloc_move(mem_ctx, &state->rdata.data);
+		*num_data = state->rdata.total;
+	} else {
+		TALLOC_FREE(state->rdata.data);
+	}
+
+	return NT_STATUS_OK;
+}
+
+NTSTATUS cli_trans(TALLOC_CTX *mem_ctx, struct cli_state *cli,
+		   uint8_t trans_cmd,
+		   const char *pipe_name, uint16_t fid, uint16_t function,
+		   int flags,
+		   uint16_t *setup, uint8_t num_setup, uint8_t max_setup,
+		   uint8_t *param, uint32_t num_param, uint32_t max_param,
+		   uint8_t *data, uint32_t num_data, uint32_t max_data,
+		   uint16_t **rsetup, uint8_t *num_rsetup,
+		   uint8_t **rparam, uint32_t *num_rparam,
+		   uint8_t **rdata, uint32_t *num_rdata)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct event_context *ev;
+	struct async_req *req;
+	NTSTATUS status = NT_STATUS_NO_MEMORY;
+
+	if (cli->fd_event != NULL) {
+		/*
+		 * Can't use sync call while an async call is in flight
+		 */
+		cli_set_error(cli, NT_STATUS_INVALID_PARAMETER);
+		goto fail;
+	}
+
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		goto fail;
+	}
+
+	req = cli_trans_send(frame, ev, cli, trans_cmd,
+			     pipe_name, fid, function, flags,
+			     setup, num_setup, max_setup,
+			     param, num_param, max_param,
+			     data, num_data, max_data);
+	if (req == NULL) {
+		goto fail;
+	}
+
+	while (req->state < ASYNC_REQ_DONE) {
+		event_loop_once(ev);
+	}
+
+	status = cli_trans_recv(req, mem_ctx, rsetup, num_rsetup,
+				rparam, num_rparam, rdata, num_rdata);
+ fail:
+	TALLOC_FREE(frame);
+	return status;
+}