r17083: - implement SMB2 Cancel in the client

- the 0xffffffffffffffff seqnum is reserved for SMB2 Break (oplock breaks)
  so don't use it in a request. we should someday try to test this...

metze
(This used to be commit 730cdc4475822e28cb400116641294a7f98ad0b5)

1 files changed, 78 insertions, 0 deletions

diff --git a/source4/libcli/smb2/cancel.c b/source4/libcli/smb2/cancel.c
new file mode 100644
index 0000000000..bf48af7b00
--- /dev/null
+++ b/source4/libcli/smb2/cancel.c
@@ -0,0 +1,78 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   SMB2 client notify calls
+
+   Copyright (C) Stefan Metzmacher 2006
+   
+   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 "libcli/smb2/smb2_calls.h"
+
+/*
+  send a cancel request
+*/
+NTSTATUS smb2_cancel(struct smb2_request *r)
+{
+	NTSTATUS status;
+	struct smb2_request *c;
+	uint32_t old_timeout;
+	uint64_t old_seqnum;
+
+	/* 
+	 * if we don't get a pending id yet, we just
+	 * mark the request for pending, so that we directly
+	 * send the cancel after getting the pending id
+	 */
+	if (!r->cancel.can_cancel) {
+		r->cancel.do_cancel++;
+		return NT_STATUS_OK;
+	}
+
+	/* we don't want a seqmun for a SMB2 Cancel */
+	old_seqnum = r->transport->seqnum;
+	c = smb2_request_init(r->transport, SMB2_OP_CANCEL, 0x04, False, 0);
+	r->transport->seqnum = old_seqnum;
+	NT_STATUS_HAVE_NO_MEMORY(c);
+	c->seqnum = 0;
+
+	SIVAL(c->out.hdr, SMB2_HDR_FLAGS,	0x00000002);
+	SSVAL(c->out.hdr, SMB2_HDR_UNKNOWN1,	0x0030);
+	SIVAL(c->out.hdr, SMB2_HDR_PID,		r->cancel.pending_id);
+	SBVAL(c->out.hdr, SMB2_HDR_SEQNUM,	c->seqnum);
+	if (r->session) {
+		SBVAL(c->out.hdr, SMB2_HDR_UID,	r->session->uid);
+	}
+
+	SSVAL(c->out.body, 0x02, 0);
+
+	old_timeout = c->transport->options.timeout;
+	c->transport->options.timeout = 0;
+	smb2_transport_send(c);
+	c->transport->options.timeout = old_timeout;
+
+	if (c->state == SMB2_REQUEST_ERROR) {
+		status = c->status;
+	} else {
+		status = NT_STATUS_OK;
+	}
+
+	talloc_free(c);
+	return status;
+}