libsmb: Add smb2cli_notify()

Bug: https://bugzilla.samba.org/show_bug.cgi?id=13382
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
(cherry picked from commit ad33964f8c85b67a2d2b451bece208d8bfb8cad6)

3 files changed, 205 insertions, 0 deletions

diff --git a/libcli/smb/smb2cli_notify.c b/libcli/smb/smb2cli_notify.c
new file mode 100644
index 00000000000..0a23cf9ad03
--- /dev/null
+++ b/libcli/smb/smb2cli_notify.c
@@ -0,0 +1,178 @@
+/*
+   Unix SMB/CIFS implementation.
+   smb2 lib
+   Copyright (C) Volker Lendecke 2017
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "lib/util/tevent_ntstatus.h"
+#include "smb_common.h"
+#include "smbXcli_base.h"
+#include "librpc/gen_ndr/ndr_notify.h"
+
+struct smb2cli_notify_state {
+	uint8_t fixed[32];
+
+	struct iovec *recv_iov;
+	uint8_t *data;
+	uint32_t data_length;
+};
+
+static void smb2cli_notify_done(struct tevent_req *subreq);
+
+struct tevent_req *smb2cli_notify_send(TALLOC_CTX *mem_ctx,
+				       struct tevent_context *ev,
+				       struct smbXcli_conn *conn,
+				       uint32_t timeout_msec,
+				       struct smbXcli_session *session,
+				       struct smbXcli_tcon *tcon,
+				       uint32_t output_buffer_length,
+				       uint64_t fid_persistent,
+				       uint64_t fid_volatile,
+				       uint32_t completion_filter,
+				       bool recursive)
+{
+	struct tevent_req *req, *subreq;
+	struct smb2cli_notify_state *state;
+	uint8_t *fixed;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct smb2cli_notify_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	fixed = state->fixed;
+	SSVAL(fixed, 0, 32);
+	SSVAL(fixed, 2, recursive ? SMB2_WATCH_TREE : 0);
+	SIVAL(fixed, 4, output_buffer_length);
+	SBVAL(fixed, 8, fid_persistent);
+	SBVAL(fixed, 16, fid_volatile);
+	SIVAL(fixed, 24, completion_filter);
+	SIVAL(fixed, 28, 0); 	/* reserved */
+
+	subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_NOTIFY,
+				  0, 0, /* flags */
+				  timeout_msec,
+				  tcon,
+				  session,
+				  state->fixed, sizeof(state->fixed),
+				  NULL, 0, /* dyn* */
+				  0); /* max_dyn_len */
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, smb2cli_notify_done, req);
+	return req;
+}
+
+static void smb2cli_notify_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct smb2cli_notify_state *state = tevent_req_data(
+		req, struct smb2cli_notify_state);
+	NTSTATUS status;
+	struct iovec *iov;
+	uint16_t data_offset;
+	static const struct smb2cli_req_expected_response expected[] = {
+	{
+		.status = NT_STATUS_OK,
+		.body_size = 0x09
+	}
+	};
+
+	status = smb2cli_req_recv(subreq, state, &iov,
+				  expected, ARRAY_SIZE(expected));
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	data_offset = SVAL(iov[1].iov_base, 2);
+	state->data_length = IVAL(iov[1].iov_base, 4);
+
+	if ((data_offset != SMB2_HDR_BODY + 8) ||
+	    (state->data_length > iov[2].iov_len)) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+
+	state->recv_iov = iov;
+	state->data = (uint8_t *)iov[2].iov_base;
+	tevent_req_done(req);
+}
+
+NTSTATUS smb2cli_notify_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			     uint8_t **data, uint32_t *data_length)
+{
+	struct smb2cli_notify_state *state = tevent_req_data(
+		req, struct smb2cli_notify_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	talloc_steal(mem_ctx, state->recv_iov);
+	*data_length = state->data_length;
+	*data = state->data;
+	return NT_STATUS_OK;
+}
+
+NTSTATUS smb2cli_notify(struct smbXcli_conn *conn,
+			uint32_t timeout_msec,
+			struct smbXcli_session *session,
+			struct smbXcli_tcon *tcon,
+			uint32_t output_buffer_length,
+			uint64_t fid_persistent,
+			uint64_t fid_volatile,
+			uint32_t completion_filter,
+			bool recursive,
+			TALLOC_CTX *mem_ctx,
+			uint8_t **data,
+			uint32_t *data_length)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	NTSTATUS status = NT_STATUS_NO_MEMORY;
+
+	if (smbXcli_conn_has_async_calls(conn)) {
+		/*
+		 * Can't use sync call while an async call is in flight
+		 */
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto fail;
+	}
+	ev = samba_tevent_context_init(frame);
+	if (ev == NULL) {
+		goto fail;
+	}
+	req = smb2cli_notify_send(frame, ev, conn, timeout_msec,
+				  session, tcon, output_buffer_length,
+				  fid_persistent, fid_volatile,
+				  completion_filter, recursive);
+	if (req == NULL) {
+		goto fail;
+	}
+	if (!tevent_req_poll_ntstatus(req, ev, &status)) {
+		goto fail;
+	}
+	status = smb2cli_notify_recv(req, mem_ctx, data, data_length);
+ fail:
+	TALLOC_FREE(frame);
+	return status;
+}
diff --git a/libcli/smb/smbXcli_base.h b/libcli/smb/smbXcli_base.h
index 2532084c524..20ef26e3353 100644
--- a/libcli/smb/smbXcli_base.h
+++ b/libcli/smb/smbXcli_base.h
@@ -811,6 +811,32 @@ NTSTATUS smb2cli_query_directory(struct smbXcli_conn *conn,
 				 uint8_t **data,
 				 uint32_t *data_length);
 
+struct tevent_req *smb2cli_notify_send(TALLOC_CTX *mem_ctx,
+				       struct tevent_context *ev,
+				       struct smbXcli_conn *conn,
+				       uint32_t timeout_msec,
+				       struct smbXcli_session *session,
+				       struct smbXcli_tcon *tcon,
+				       uint32_t output_buffer_length,
+				       uint64_t fid_persistent,
+				       uint64_t fid_volatile,
+				       uint32_t completion_filter,
+				       bool recursive);
+NTSTATUS smb2cli_notify_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			     uint8_t **data, uint32_t *data_length);
+NTSTATUS smb2cli_notify(struct smbXcli_conn *conn,
+			uint32_t timeout_msec,
+			struct smbXcli_session *session,
+			struct smbXcli_tcon *tcon,
+			uint32_t output_buffer_length,
+			uint64_t fid_persistent,
+			uint64_t fid_volatile,
+			uint32_t completion_filter,
+			bool recursive,
+			TALLOC_CTX *mem_ctx,
+			uint8_t **data,
+			uint32_t *data_length);
+
 struct tevent_req *smb2cli_ioctl_send(TALLOC_CTX *mem_ctx,
 				      struct tevent_context *ev,
 				      struct smbXcli_conn *conn,
diff --git a/libcli/smb/wscript b/libcli/smb/wscript
index e6628266ddc..53a5c213953 100644
--- a/libcli/smb/wscript
+++ b/libcli/smb/wscript
@@ -39,6 +39,7 @@ def build(bld):
            smb2cli_flush.c
            smb2cli_set_info.c
            smb2cli_query_info.c
+           smb2cli_notify.c
            smb2cli_query_directory.c
            smb2cli_ioctl.c
            smb2cli_echo.c