r11662: the beginnings of a SMB2 client library. Very hackish, meant for experimentation

(This used to be commit 68422dc73f6ea51bf906f3db223ae8abf077aba1)

6 files changed, 689 insertions, 0 deletions

diff --git a/source4/libcli/config.mk b/source4/libcli/config.mk
index ea93b12a03..8417d770b6 100644
--- a/source4/libcli/config.mk
+++ b/source4/libcli/config.mk
@@ -122,3 +122,5 @@ OBJ_FILES = raw/rawfile.o \
 		raw/rawdate.o \
 		raw/rawlpq.o
 REQUIRED_SUBSYSTEMS = LIBPACKET
+
+include smb2/config.mk
diff --git a/source4/libcli/smb2/config.mk b/source4/libcli/smb2/config.mk
new file mode 100644
index 0000000000..9840876c2f
--- /dev/null
+++ b/source4/libcli/smb2/config.mk
@@ -0,0 +1,6 @@
+[SUBSYSTEM::LIBCLI_SMB2]
+OBJ_FILES = \
+	transport.o \
+	request.o \
+	negprot.o
+REQUIRED_SUBSYSTEMS = LIBCLI_RAW LIBPACKET
diff --git a/source4/libcli/smb2/negprot.c b/source4/libcli/smb2/negprot.c
new file mode 100644
index 0000000000..6b35373807
--- /dev/null
+++ b/source4/libcli/smb2/negprot.c
@@ -0,0 +1,82 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   SMB2 client negprot handling
+
+   Copyright (C) Andrew Tridgell 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "libcli/raw/libcliraw.h"
+#include "libcli/smb2/smb2.h"
+
+/*
+  send a negprot request
+*/
+struct smb2_request *smb2_negprot_send(struct smb2_transport *transport)
+{
+	struct smb2_request *req;
+
+	req = smb2_request_init(transport, SMB2_OP_NEGPROT, 0x26);
+	if (req == NULL) return NULL;
+
+	memset(req->out.body, 0, 0x26);
+	SIVAL(req->out.body, 0, 0x00010024); /* unknown */
+
+	smb2_transport_send(req);
+
+	return req;
+}
+
+/*
+  recv a negprot reply
+*/
+NTSTATUS smb2_negprot_recv(struct smb2_request *req)
+{
+	NTTIME t1, t2;
+	DATA_BLOB secblob;
+	struct GUID guid;
+	NTSTATUS status;
+
+	if (!smb2_request_receive(req) || 
+	    smb2_request_is_error(req)) {
+		return smb2_request_destroy(req);
+	}
+
+	t1 = smbcli_pull_nttime(req->in.body, 0x28);
+	t2 = smbcli_pull_nttime(req->in.body, 0x30);
+
+	secblob = smb2_pull_blob(req, req->in.body+0x40, req->in.body_size - 0x40);
+	status  = smb2_pull_guid(req, req->in.body+0x08, &guid);
+	NT_STATUS_NOT_OK_RETURN(status);
+
+	printf("Negprot reply:\n");
+	printf("t1  =%s\n", nt_time_string(req, t1));
+	printf("t2  =%s\n", nt_time_string(req, t2));
+	printf("guid=%s\n", GUID_string(req, &guid));
+
+	return smb2_request_destroy(req);
+}
+
+/*
+  sync negprot request
+*/
+NTSTATUS smb2_negprot(struct smb2_transport *transport)
+{
+	struct smb2_request *req = smb2_negprot_send(transport);
+	return smb2_negprot_recv(req);
+}
diff --git a/source4/libcli/smb2/request.c b/source4/libcli/smb2/request.c
new file mode 100644
index 0000000000..1b2dc5e64c
--- /dev/null
+++ b/source4/libcli/smb2/request.c
@@ -0,0 +1,171 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   SMB2 client request handling
+
+   Copyright (C) Andrew Tridgell 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "libcli/raw/libcliraw.h"
+#include "libcli/smb2/smb2.h"
+#include "include/dlinklist.h"
+#include "lib/events/events.h"
+#include "librpc/gen_ndr/ndr_misc.h"
+
+/*
+  initialise a smb2 request
+*/
+struct smb2_request *smb2_request_init(struct smb2_transport *transport, 
+				       uint16_t opcode, uint32_t body_size)
+{
+	struct smb2_request *req;
+
+	req = talloc(transport, struct smb2_request);
+	if (req == NULL) return NULL;
+
+	req->state     = SMB2_REQUEST_INIT;
+	req->transport = transport;
+	req->seqnum    = transport->seqnum++;
+	req->status    = NT_STATUS_OK;
+	req->async.fn  = NULL;
+	req->next = req->prev = NULL;
+
+	ZERO_STRUCT(req->in);
+	
+	req->out.allocated = SMB2_HDR_BODY+NBT_HDR_SIZE+body_size;
+	req->out.buffer    = talloc_size(req, req->out.allocated);
+	if (req->out.buffer == NULL) {
+		talloc_free(req);
+		return NULL;
+	}
+
+	req->out.size      = SMB2_HDR_BODY+NBT_HDR_SIZE + body_size;
+	req->out.hdr       = req->out.buffer + NBT_HDR_SIZE;
+	req->out.body      = req->out.hdr + SMB2_HDR_BODY;
+	req->out.body_size = body_size;
+	req->out.ptr       = req->out.body;
+
+	SIVAL(req->out.hdr, 0,                SMB2_MAGIC);
+	SSVAL(req->out.hdr, SMB2_HDR_LENGTH,  SMB2_HDR_BODY);
+	SSVAL(req->out.hdr, SMB2_HDR_PAD1,    0);
+	SIVAL(req->out.hdr, SMB2_HDR_STATUS,  0);
+	SSVAL(req->out.hdr, SMB2_HDR_OPCODE,  opcode);
+	SSVAL(req->out.hdr, SMB2_HDR_PAD2,    0);
+	SIVAL(req->out.hdr, SMB2_HDR_FLAGS,   0);
+	SIVAL(req->out.hdr, SMB2_HDR_UNKNOWN, 0);
+	SBVAL(req->out.hdr, SMB2_HDR_SEQNUM,  req->seqnum);
+	SIVAL(req->out.hdr, SMB2_HDR_PID,     0);
+	SIVAL(req->out.hdr, SMB2_HDR_TID,     0);
+	SIVAL(req->out.hdr, SMB2_HDR_UID,     0);
+	SIVAL(req->out.hdr, SMB2_HDR_UID2,    0);
+	memset(req->out.hdr+SMB2_HDR_SIG, 0, 16);
+
+	return req;
+}
+
+/* destroy a request structure and return final status */
+NTSTATUS smb2_request_destroy(struct smb2_request *req)
+{
+	NTSTATUS status;
+
+	/* this is the error code we give the application for when a
+	   _send() call fails completely */
+	if (!req) return NT_STATUS_UNSUCCESSFUL;
+
+	if (req->transport) {
+		/* remove it from the list of pending requests (a null op if
+		   its not in the list) */
+		DLIST_REMOVE(req->transport->pending_recv, req);
+	}
+
+	if (req->state == SMBCLI_REQUEST_ERROR &&
+	    NT_STATUS_IS_OK(req->status)) {
+		req->status = NT_STATUS_INTERNAL_ERROR;
+	}
+
+	status = req->status;
+	talloc_free(req);
+	return status;
+}
+
+/*
+  receive a response to a packet
+*/
+BOOL smb2_request_receive(struct smb2_request *req)
+{
+	/* req can be NULL when a send has failed. This eliminates lots of NULL
+	   checks in each module */
+	if (!req) return False;
+
+	/* keep receiving packets until this one is replied to */
+	while (req->state <= SMB2_REQUEST_RECV) {
+		if (event_loop_once(req->transport->socket->event.ctx) != 0) {
+			return False;
+		}
+	}
+
+	return req->state == SMB2_REQUEST_DONE;
+}
+
+/* Return true if the last packet was in error */
+BOOL smb2_request_is_error(struct smb2_request *req)
+{
+	return NT_STATUS_IS_ERR(req->status);
+}
+
+/*
+  check if a range in the reply body is out of bounds
+*/
+BOOL smb2_oob(struct smb2_request *req, const uint8_t *ptr, uint_t size)
+{
+	/* be careful with wraparound! */
+	if (ptr < req->in.body ||
+	    ptr >= req->in.body + req->in.body_size ||
+	    size > req->in.body_size ||
+	    ptr + size > req->in.body + req->in.body_size) {
+		return True;
+	}
+	return False;
+}
+
+/*
+  pull a data blob from the body of a reply
+*/
+DATA_BLOB smb2_pull_blob(struct smb2_request *req, uint8_t *ptr, uint_t size)
+{
+	if (smb2_oob(req, ptr, size)) {
+		return data_blob(NULL, 0);
+	}
+	return data_blob_talloc(req, ptr, size);
+}
+
+/*
+  pull a guid from the reply body
+*/
+NTSTATUS smb2_pull_guid(struct smb2_request *req, uint8_t *ptr, struct GUID *guid)
+{
+	NTSTATUS status;
+	DATA_BLOB blob = smb2_pull_blob(req, ptr, 16);
+	if (blob.data == NULL) {
+		return NT_STATUS_BUFFER_TOO_SMALL;
+	}
+	status = ndr_pull_struct_blob(&blob, req, guid, 
+				      (ndr_pull_flags_fn_t)ndr_pull_GUID);
+	data_blob_free(&blob);
+	return status;
+}
diff --git a/source4/libcli/smb2/smb2.h b/source4/libcli/smb2/smb2.h
new file mode 100644
index 0000000000..2e01159355
--- /dev/null
+++ b/source4/libcli/smb2/smb2.h
@@ -0,0 +1,154 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   SMB2 client library header
+
+   Copyright (C) Andrew Tridgell 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+struct smb2_options {
+	uint32_t timeout;
+};
+
+/*
+  information returned from the negotiate response
+*/
+struct smb2_negotiate {
+	DATA_BLOB secblob;
+	
+};
+
+/* this is the context for the smb2 transport layer */
+struct smb2_transport {
+	/* socket level info */
+	struct smbcli_socket *socket;
+
+	struct smb2_options options;
+	struct smb2_negotiate negotiate;
+
+	/* next seqnum to allocate */
+	uint64_t seqnum;
+
+	/* a list of requests that are pending for receive on this
+	   connection */
+	struct smb2_request *pending_recv;
+
+	/* context of the stream -> packet parser */
+	struct packet_context *packet;
+};
+
+
+struct smb2_request_buffer {
+	/* the raw SMB2 buffer, including the 4 byte length header */
+	uint8_t *buffer;
+	
+	/* the size of the raw buffer, including 4 byte header */
+	uint_t size;
+	
+	/* how much has been allocated - on reply the buffer is over-allocated to 
+	   prevent too many realloc() calls 
+	*/
+	uint_t allocated;
+	
+	/* the start of the SMB2 header - this is always buffer+4 */
+	uint8_t *hdr;
+	
+	/* the packet body */
+	uint8_t *body;
+	uint_t body_size;
+	
+	/* ptr is used as a moving pointer into the data area
+	 * of the packet. The reason its here and not a local
+	 * variable in each function is that when a realloc of
+	 * a send packet is done we need to move this
+	 * pointer */
+	uint8_t *ptr;
+};
+
+
+/*
+  a client request moves between the following 4 states.
+*/
+enum smb2_request_state {SMB2_REQUEST_INIT, /* we are creating the request */
+			SMB2_REQUEST_RECV, /* we are waiting for a matching reply */
+			SMB2_REQUEST_DONE, /* the request is finished */
+			SMB2_REQUEST_ERROR}; /* a packet or transport level error has occurred */
+
+/* the context for a single SMB2 request */
+struct smb2_request {
+	/* allow a request to be part of a list of requests */
+	struct smb2_request *next, *prev;
+
+	/* each request is in one of 3 possible states */
+	enum smb2_request_state state;
+	
+	struct smb2_transport *transport;
+
+	uint64_t seqnum;
+
+	/* the NT status for this request. Set by packet receive code
+	   or code detecting error. */
+	NTSTATUS status;
+	
+	struct smb2_request_buffer in;
+	struct smb2_request_buffer out;
+
+	/* information on what to do with a reply when it is received
+	   asyncronously. If this is not setup when a reply is received then
+	   the reply is discarded
+
+	   The private pointer is private to the caller of the client
+	   library (the application), not private to the library
+	*/
+	struct {
+		void (*fn)(struct smb2_request *);
+		void *private;
+	} async;
+};
+
+
+#define SMB2_MIN_SIZE 0x40
+
+/* offsets into header elements */
+#define SMB2_HDR_LENGTH  0x04
+#define SMB2_HDR_PAD1    0x06
+#define SMB2_HDR_STATUS  0x08
+#define SMB2_HDR_OPCODE  0x0c
+#define SMB2_HDR_PAD2    0x0e
+#define SMB2_HDR_FLAGS   0x10
+#define SMB2_HDR_UNKNOWN 0x14
+#define SMB2_HDR_SEQNUM  0x18
+#define SMB2_HDR_PID     0x20
+#define SMB2_HDR_TID     0x24
+#define SMB2_HDR_UID     0x28
+#define SMB2_HDR_UID2    0x2c /* whats this? */
+#define SMB2_HDR_SIG     0x30 /* guess ... */
+#define SMB2_HDR_BODY    0x40
+
+/* SMB2 opcodes */
+#define SMB2_OP_NEGPROT   0x00
+#define SMB2_OP_SESSSETUP 0x01
+#define SMB2_OP_TCON      0x03
+#define SMB2_OP_TDIS      0x04
+#define SMB2_OP_CREATE    0x05
+#define SMB2_OP_CLOSE     0x06
+#define SMB2_OP_READ      0x08
+#define SMB2_OP_WRITE     0x09
+#define SMB2_OP_FIND      0x0e
+
+#define SMB2_MAGIC 0x424D53FE /* 0xFE 'S' 'M' 'B' */
+
diff --git a/source4/libcli/smb2/transport.c b/source4/libcli/smb2/transport.c
new file mode 100644
index 0000000000..a178b35f93
--- /dev/null
+++ b/source4/libcli/smb2/transport.c
@@ -0,0 +1,274 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   SMB2 client transport context management functions
+
+   Copyright (C) Andrew Tridgell 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "libcli/raw/libcliraw.h"
+#include "libcli/smb2/smb2.h"
+#include "lib/socket/socket.h"
+#include "lib/events/events.h"
+#include "lib/stream/packet.h"
+#include "include/dlinklist.h"
+
+
+/*
+  an event has happened on the socket
+*/
+static void smb2_transport_event_handler(struct event_context *ev, 
+					 struct fd_event *fde, 
+					 uint16_t flags, void *private)
+{
+	struct smb2_transport *transport = talloc_get_type(private,
+							   struct smb2_transport);
+	if (flags & EVENT_FD_READ) {
+		packet_recv(transport->packet);
+		return;
+	}
+	if (flags & EVENT_FD_WRITE) {
+		packet_queue_run(transport->packet);
+	}
+}
+
+/*
+  destroy a transport
+ */
+static int transport_destructor(void *ptr)
+{
+	struct smb2_transport *transport = ptr;
+	smb2_transport_dead(transport);
+	return 0;
+}
+
+
+/*
+  handle receive errors
+*/
+static void smb2_transport_error(void *private, NTSTATUS status)
+{
+	struct smb2_transport *transport = talloc_get_type(private, 
+							   struct smb2_transport);
+	smb2_transport_dead(transport);
+}
+
+static NTSTATUS smb2_transport_finish_recv(void *private, DATA_BLOB blob);
+
+/*
+  create a transport structure based on an established socket
+*/
+struct smb2_transport *smb2_transport_init(struct smbcli_socket *sock,
+					   TALLOC_CTX *parent_ctx)
+{
+	struct smb2_transport *transport;
+
+	transport = talloc_zero(parent_ctx, struct smb2_transport);
+	if (!transport) return NULL;
+
+	transport->socket = talloc_steal(transport, sock);
+
+	/* setup the stream -> packet parser */
+	transport->packet = packet_init(transport);
+	if (transport->packet == NULL) {
+		talloc_free(transport);
+		return NULL;
+	}
+	packet_set_private(transport->packet, transport);
+	packet_set_socket(transport->packet, transport->socket->sock);
+	packet_set_callback(transport->packet, smb2_transport_finish_recv);
+	packet_set_full_request(transport->packet, packet_full_request_nbt);
+	packet_set_error_handler(transport->packet, smb2_transport_error);
+	packet_set_event_context(transport->packet, transport->socket->event.ctx);
+	packet_set_nofree(transport->packet);
+
+	/* take over event handling from the socket layer - it only
+	   handles events up until we are connected */
+	talloc_free(transport->socket->event.fde);
+	transport->socket->event.fde = event_add_fd(transport->socket->event.ctx,
+						    transport->socket,
+						    socket_get_fd(transport->socket->sock),
+						    EVENT_FD_READ,
+						    smb2_transport_event_handler,
+						    transport);
+
+	packet_set_serialise(transport->packet, transport->socket->event.fde);
+
+	talloc_set_destructor(transport, transport_destructor);
+
+	transport->options.timeout = 30;
+
+	return transport;
+}
+
+/*
+  mark the transport as dead
+*/
+void smb2_transport_dead(struct smb2_transport *transport)
+{
+	smbcli_sock_dead(transport->socket);
+
+	/* kill all pending receives */
+	while (transport->pending_recv) {
+		struct smb2_request *req = transport->pending_recv;
+		req->state = SMB2_REQUEST_ERROR;
+		req->status = NT_STATUS_NET_WRITE_FAULT;
+		DLIST_REMOVE(transport->pending_recv, req);
+		if (req->async.fn) {
+			req->async.fn(req);
+		}
+	}
+}
+
+/*
+  we have a full request in our receive buffer - match it to a pending request
+  and process
+ */
+static NTSTATUS smb2_transport_finish_recv(void *private, DATA_BLOB blob)
+{
+	struct smb2_transport *transport = talloc_get_type(private, 
+							     struct smb2_transport);
+	uint8_t *buffer, *hdr;
+	int len;
+	struct smb2_request *req;
+	uint64_t seqnum;
+
+	buffer = blob.data;
+	len = blob.length;
+
+	hdr = buffer+NBT_HDR_SIZE;
+
+	if (len < SMB2_MIN_SIZE) {
+		DEBUG(1,("Discarding smb2 reply of size %d\n", len));
+		goto error;
+	}
+
+	seqnum = BVAL(hdr, SMB2_HDR_SEQNUM);
+
+	/* match the incoming request against the list of pending requests */
+	for (req=transport->pending_recv; req; req=req->next) {
+		if (req->seqnum == seqnum) break;
+	}
+
+	if (!req) {
+		DEBUG(1,("Discarding unmatched reply with seqnum 0x%llx op %d\n", 
+			 seqnum, SVAL(hdr, SMB2_HDR_OPCODE)));
+		goto error;
+	}
+
+	/* fill in the 'in' portion of the matching request */
+	req->in.buffer = buffer;
+	talloc_steal(req, buffer);
+	req->in.size = len;
+	req->in.allocated = req->in.size;
+
+	req->in.hdr       = hdr;
+	req->in.body      = hdr+SMB2_HDR_BODY;
+	req->in.body_size = req->in.size - (SMB2_HDR_BODY+NBT_HDR_SIZE);
+	req->in.ptr       = req->in.body;
+	req->status       = NT_STATUS(IVAL(hdr, SMB2_HDR_STATUS));
+
+	/* if this request has an async handler then call that to
+	   notify that the reply has been received. This might destroy
+	   the request so it must happen last */
+	DLIST_REMOVE(transport->pending_recv, req);
+	req->state = SMB2_REQUEST_DONE;
+	if (req->async.fn) {
+		req->async.fn(req);
+	}
+	return NT_STATUS_OK;
+
+error:
+	if (req) {
+		DLIST_REMOVE(transport->pending_recv, req);
+		req->state = SMB2_REQUEST_ERROR;
+	}
+	dump_data(0, blob.data, blob.length);
+	data_blob_free(&blob);
+	return NT_STATUS_UNSUCCESSFUL;
+}
+
+/*
+  handle timeouts of individual smb requests
+*/
+static void smb2_timeout_handler(struct event_context *ev, struct timed_event *te, 
+				   struct timeval t, void *private)
+{
+	struct smb2_request *req = talloc_get_type(private, struct smb2_request);
+
+	if (req->state == SMB2_REQUEST_RECV) {
+		DLIST_REMOVE(req->transport->pending_recv, req);
+	}
+	req->status = NT_STATUS_IO_TIMEOUT;
+	req->state = SMB2_REQUEST_ERROR;
+	if (req->async.fn) {
+		req->async.fn(req);
+	}
+}
+
+
+/*
+  destroy a request
+*/
+static int smb2_request_destructor(void *ptr)
+{
+	struct smb2_request *req = talloc_get_type(ptr, struct smb2_request);
+	if (req->state == SMB2_REQUEST_RECV) {
+		DLIST_REMOVE(req->transport->pending_recv, req);
+	}
+	return 0;
+}
+
+
+/*
+  put a request into the send queue
+*/
+void smb2_transport_send(struct smb2_request *req)
+{
+	DATA_BLOB blob;
+	NTSTATUS status;
+
+	_smb_setlen(req->out.buffer, req->out.size - NBT_HDR_SIZE);
+
+	/* check if the transport is dead */
+	if (req->transport->socket->sock == NULL) {
+		req->state = SMB2_REQUEST_ERROR;
+		req->status = NT_STATUS_NET_WRITE_FAULT;
+		return;
+	}
+
+	blob = data_blob_const(req->out.buffer, req->out.size);
+	status = packet_send(req->transport->packet, blob);
+	if (!NT_STATUS_IS_OK(status)) {
+		req->state = SMB2_REQUEST_ERROR;
+		req->status = status;
+		return;
+	}
+
+	req->state = SMB2_REQUEST_RECV;
+	DLIST_ADD(req->transport->pending_recv, req);
+
+	/* add a timeout */
+	if (req->transport->options.timeout) {
+		event_add_timed(req->transport->socket->event.ctx, req, 
+				timeval_current_ofs(req->transport->options.timeout, 0), 
+				smb2_timeout_handler, req);
+	}
+
+	talloc_set_destructor(req, smb2_request_destructor);
+}