s3:winbind: Add async wb_seqnum

12 files changed, 447 insertions, 2 deletions

diff --git a/source3/Makefile.in b/source3/Makefile.in
index c2cd8caa2e..14bc86dbf7 100644
--- a/source3/Makefile.in
+++ b/source3/Makefile.in
@@ -1164,6 +1164,7 @@ WINBINDD_OBJ1 = \
 		winbindd/wb_lookupusergroups.o \
 		winbindd/wb_getpwsid.o \
 		winbindd/wb_gettoken.o \
+		winbindd/wb_seqnum.o \
 		winbindd/winbindd_lookupsid.o \
 		winbindd/winbindd_lookupname.o \
 		winbindd/winbindd_sid_to_uid.o \
diff --git a/source3/librpc/gen_ndr/cli_wbint.c b/source3/librpc/gen_ndr/cli_wbint.c
index de6b345a0e..07486c2e40 100644
--- a/source3/librpc/gen_ndr/cli_wbint.c
+++ b/source3/librpc/gen_ndr/cli_wbint.c
@@ -1645,3 +1645,159 @@ NTSTATUS rpccli_wbint_LookupUserGroups(struct rpc_pipe_client *cli,
 	return r.out.result;
 }
 
+struct rpccli_wbint_QuerySequenceNumber_state {
+	struct wbint_QuerySequenceNumber orig;
+	struct wbint_QuerySequenceNumber tmp;
+	TALLOC_CTX *out_mem_ctx;
+	NTSTATUS (*dispatch_recv)(struct tevent_req *req, TALLOC_CTX *mem_ctx);
+};
+
+static void rpccli_wbint_QuerySequenceNumber_done(struct tevent_req *subreq);
+
+struct tevent_req *rpccli_wbint_QuerySequenceNumber_send(TALLOC_CTX *mem_ctx,
+							 struct tevent_context *ev,
+							 struct rpc_pipe_client *cli,
+							 uint32_t *_sequence /* [out] [ref] */)
+{
+	struct tevent_req *req;
+	struct rpccli_wbint_QuerySequenceNumber_state *state;
+	struct tevent_req *subreq;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct rpccli_wbint_QuerySequenceNumber_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->out_mem_ctx = NULL;
+	state->dispatch_recv = cli->dispatch_recv;
+
+	/* In parameters */
+
+	/* Out parameters */
+	state->orig.out.sequence = _sequence;
+
+	/* Result */
+	ZERO_STRUCT(state->orig.out.result);
+
+	if (DEBUGLEVEL >= 10) {
+		NDR_PRINT_IN_DEBUG(wbint_QuerySequenceNumber, &state->orig);
+	}
+
+	state->out_mem_ctx = talloc_named_const(state, 0,
+			     "rpccli_wbint_QuerySequenceNumber_out_memory");
+	if (tevent_req_nomem(state->out_mem_ctx, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	/* make a temporary copy, that we pass to the dispatch function */
+	state->tmp = state->orig;
+
+	subreq = cli->dispatch_send(state, ev, cli,
+				    &ndr_table_wbint,
+				    NDR_WBINT_QUERYSEQUENCENUMBER,
+				    &state->tmp);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, rpccli_wbint_QuerySequenceNumber_done, req);
+	return req;
+}
+
+static void rpccli_wbint_QuerySequenceNumber_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct rpccli_wbint_QuerySequenceNumber_state *state = tevent_req_data(
+		req, struct rpccli_wbint_QuerySequenceNumber_state);
+	NTSTATUS status;
+	TALLOC_CTX *mem_ctx;
+
+	if (state->out_mem_ctx) {
+		mem_ctx = state->out_mem_ctx;
+	} else {
+		mem_ctx = state;
+	}
+
+	status = state->dispatch_recv(subreq, mem_ctx);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	/* Copy out parameters */
+	*state->orig.out.sequence = *state->tmp.out.sequence;
+
+	/* Copy result */
+	state->orig.out.result = state->tmp.out.result;
+
+	/* Reset temporary structure */
+	ZERO_STRUCT(state->tmp);
+
+	if (DEBUGLEVEL >= 10) {
+		NDR_PRINT_OUT_DEBUG(wbint_QuerySequenceNumber, &state->orig);
+	}
+
+	tevent_req_done(req);
+}
+
+NTSTATUS rpccli_wbint_QuerySequenceNumber_recv(struct tevent_req *req,
+					       TALLOC_CTX *mem_ctx,
+					       NTSTATUS *result)
+{
+	struct rpccli_wbint_QuerySequenceNumber_state *state = tevent_req_data(
+		req, struct rpccli_wbint_QuerySequenceNumber_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		tevent_req_received(req);
+		return status;
+	}
+
+	/* Steal possbile out parameters to the callers context */
+	talloc_steal(mem_ctx, state->out_mem_ctx);
+
+	/* Return result */
+	*result = state->orig.out.result;
+
+	tevent_req_received(req);
+	return NT_STATUS_OK;
+}
+
+NTSTATUS rpccli_wbint_QuerySequenceNumber(struct rpc_pipe_client *cli,
+					  TALLOC_CTX *mem_ctx,
+					  uint32_t *sequence /* [out] [ref] */)
+{
+	struct wbint_QuerySequenceNumber r;
+	NTSTATUS status;
+
+	/* In parameters */
+
+	if (DEBUGLEVEL >= 10) {
+		NDR_PRINT_IN_DEBUG(wbint_QuerySequenceNumber, &r);
+	}
+
+	status = cli->dispatch(cli,
+				mem_ctx,
+				&ndr_table_wbint,
+				NDR_WBINT_QUERYSEQUENCENUMBER,
+				&r);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	if (DEBUGLEVEL >= 10) {
+		NDR_PRINT_OUT_DEBUG(wbint_QuerySequenceNumber, &r);
+	}
+
+	if (NT_STATUS_IS_ERR(status)) {
+		return status;
+	}
+
+	/* Return variables */
+	*sequence = *r.out.sequence;
+
+	/* Return result */
+	return r.out.result;
+}
diff --git a/source3/librpc/gen_ndr/cli_wbint.h b/source3/librpc/gen_ndr/cli_wbint.h
index e9927c1c35..ded93309ae 100644
--- a/source3/librpc/gen_ndr/cli_wbint.h
+++ b/source3/librpc/gen_ndr/cli_wbint.h
@@ -138,4 +138,14 @@ NTSTATUS rpccli_wbint_LookupUserGroups(struct rpc_pipe_client *cli,
 				       TALLOC_CTX *mem_ctx,
 				       struct dom_sid *sid /* [in] [ref] */,
 				       struct wbint_SidArray *sids /* [out] [ref] */);
+struct tevent_req *rpccli_wbint_QuerySequenceNumber_send(TALLOC_CTX *mem_ctx,
+							 struct tevent_context *ev,
+							 struct rpc_pipe_client *cli,
+							 uint32_t *_sequence /* [out] [ref] */);
+NTSTATUS rpccli_wbint_QuerySequenceNumber_recv(struct tevent_req *req,
+					       TALLOC_CTX *mem_ctx,
+					       NTSTATUS *result);
+NTSTATUS rpccli_wbint_QuerySequenceNumber(struct rpc_pipe_client *cli,
+					  TALLOC_CTX *mem_ctx,
+					  uint32_t *sequence /* [out] [ref] */);
 #endif /* __CLI_WBINT__ */
diff --git a/source3/librpc/gen_ndr/ndr_wbint.c b/source3/librpc/gen_ndr/ndr_wbint.c
index 5a8c1c33d7..295b72f1cf 100644
--- a/source3/librpc/gen_ndr/ndr_wbint.c
+++ b/source3/librpc/gen_ndr/ndr_wbint.c
@@ -1287,6 +1287,67 @@ _PUBLIC_ void ndr_print_wbint_LookupUserGroups(struct ndr_print *ndr, const char
 	ndr->depth--;
 }
 
+static enum ndr_err_code ndr_push_wbint_QuerySequenceNumber(struct ndr_push *ndr, int flags, const struct wbint_QuerySequenceNumber *r)
+{
+	if (flags & NDR_IN) {
+	}
+	if (flags & NDR_OUT) {
+		if (r->out.sequence == NULL) {
+			return ndr_push_error(ndr, NDR_ERR_INVALID_POINTER, "NULL [ref] pointer");
+		}
+		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, *r->out.sequence));
+		NDR_CHECK(ndr_push_NTSTATUS(ndr, NDR_SCALARS, r->out.result));
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+static enum ndr_err_code ndr_pull_wbint_QuerySequenceNumber(struct ndr_pull *ndr, int flags, struct wbint_QuerySequenceNumber *r)
+{
+	TALLOC_CTX *_mem_save_sequence_0;
+	if (flags & NDR_IN) {
+		ZERO_STRUCT(r->out);
+
+		NDR_PULL_ALLOC(ndr, r->out.sequence);
+		ZERO_STRUCTP(r->out.sequence);
+	}
+	if (flags & NDR_OUT) {
+		if (ndr->flags & LIBNDR_FLAG_REF_ALLOC) {
+			NDR_PULL_ALLOC(ndr, r->out.sequence);
+		}
+		_mem_save_sequence_0 = NDR_PULL_GET_MEM_CTX(ndr);
+		NDR_PULL_SET_MEM_CTX(ndr, r->out.sequence, LIBNDR_FLAG_REF_ALLOC);
+		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, r->out.sequence));
+		NDR_PULL_SET_MEM_CTX(ndr, _mem_save_sequence_0, LIBNDR_FLAG_REF_ALLOC);
+		NDR_CHECK(ndr_pull_NTSTATUS(ndr, NDR_SCALARS, &r->out.result));
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ void ndr_print_wbint_QuerySequenceNumber(struct ndr_print *ndr, const char *name, int flags, const struct wbint_QuerySequenceNumber *r)
+{
+	ndr_print_struct(ndr, name, "wbint_QuerySequenceNumber");
+	ndr->depth++;
+	if (flags & NDR_SET_VALUES) {
+		ndr->flags |= LIBNDR_PRINT_SET_VALUES;
+	}
+	if (flags & NDR_IN) {
+		ndr_print_struct(ndr, "in", "wbint_QuerySequenceNumber");
+		ndr->depth++;
+		ndr->depth--;
+	}
+	if (flags & NDR_OUT) {
+		ndr_print_struct(ndr, "out", "wbint_QuerySequenceNumber");
+		ndr->depth++;
+		ndr_print_ptr(ndr, "sequence", r->out.sequence);
+		ndr->depth++;
+		ndr_print_uint32(ndr, "sequence", *r->out.sequence);
+		ndr->depth--;
+		ndr_print_NTSTATUS(ndr, "result", r->out.result);
+		ndr->depth--;
+	}
+	ndr->depth--;
+}
+
 static const struct ndr_interface_call wbint_calls[] = {
 	{
 		"wbint_Ping",
@@ -1368,6 +1429,14 @@ static const struct ndr_interface_call wbint_calls[] = {
 		(ndr_print_function_t) ndr_print_wbint_LookupUserGroups,
 		false,
 	},
+	{
+		"wbint_QuerySequenceNumber",
+		sizeof(struct wbint_QuerySequenceNumber),
+		(ndr_push_flags_fn_t) ndr_push_wbint_QuerySequenceNumber,
+		(ndr_pull_flags_fn_t) ndr_pull_wbint_QuerySequenceNumber,
+		(ndr_print_function_t) ndr_print_wbint_QuerySequenceNumber,
+		false,
+	},
 	{ NULL, 0, NULL, NULL, NULL, false }
 };
 
@@ -1397,7 +1466,7 @@ const struct ndr_interface_table ndr_table_wbint = {
 		NDR_WBINT_VERSION
 	},
 	.helpstring	= NDR_WBINT_HELPSTRING,
-	.num_calls	= 10,
+	.num_calls	= 11,
 	.calls		= wbint_calls,
 	.endpoints	= &wbint_endpoints,
 	.authservices	= &wbint_authservices
diff --git a/source3/librpc/gen_ndr/ndr_wbint.h b/source3/librpc/gen_ndr/ndr_wbint.h
index 6fd6b1d74d..4acdc404ec 100644
--- a/source3/librpc/gen_ndr/ndr_wbint.h
+++ b/source3/librpc/gen_ndr/ndr_wbint.h
@@ -31,7 +31,9 @@ extern const struct ndr_interface_table ndr_table_wbint;
 
 #define NDR_WBINT_LOOKUPUSERGROUPS (0x09)
 
-#define NDR_WBINT_CALL_COUNT (10)
+#define NDR_WBINT_QUERYSEQUENCENUMBER (0x0a)
+
+#define NDR_WBINT_CALL_COUNT (11)
 enum ndr_err_code ndr_push_wbint_userinfo(struct ndr_push *ndr, int ndr_flags, const struct wbint_userinfo *r);
 enum ndr_err_code ndr_pull_wbint_userinfo(struct ndr_pull *ndr, int ndr_flags, struct wbint_userinfo *r);
 void ndr_print_wbint_userinfo(struct ndr_print *ndr, const char *name, const struct wbint_userinfo *r);
@@ -51,4 +53,5 @@ void ndr_print_wbint_Gid2Sid(struct ndr_print *ndr, const char *name, int flags,
 void ndr_print_wbint_QueryUser(struct ndr_print *ndr, const char *name, int flags, const struct wbint_QueryUser *r);
 void ndr_print_wbint_LookupUserAliases(struct ndr_print *ndr, const char *name, int flags, const struct wbint_LookupUserAliases *r);
 void ndr_print_wbint_LookupUserGroups(struct ndr_print *ndr, const char *name, int flags, const struct wbint_LookupUserGroups *r);
+void ndr_print_wbint_QuerySequenceNumber(struct ndr_print *ndr, const char *name, int flags, const struct wbint_QuerySequenceNumber *r);
 #endif /* _HEADER_NDR_wbint */
diff --git a/source3/librpc/gen_ndr/srv_wbint.c b/source3/librpc/gen_ndr/srv_wbint.c
index 95c0619058..1c2799c165 100644
--- a/source3/librpc/gen_ndr/srv_wbint.c
+++ b/source3/librpc/gen_ndr/srv_wbint.c
@@ -824,6 +824,86 @@ static bool api_wbint_LookupUserGroups(pipes_struct *p)
 	return true;
 }
 
+static bool api_wbint_QuerySequenceNumber(pipes_struct *p)
+{
+	const struct ndr_interface_call *call;
+	struct ndr_pull *pull;
+	struct ndr_push *push;
+	enum ndr_err_code ndr_err;
+	DATA_BLOB blob;
+	struct wbint_QuerySequenceNumber *r;
+
+	call = &ndr_table_wbint.calls[NDR_WBINT_QUERYSEQUENCENUMBER];
+
+	r = talloc(talloc_tos(), struct wbint_QuerySequenceNumber);
+	if (r == NULL) {
+		return false;
+	}
+
+	if (!prs_data_blob(&p->in_data.data, &blob, r)) {
+		talloc_free(r);
+		return false;
+	}
+
+	pull = ndr_pull_init_blob(&blob, r, NULL);
+	if (pull == NULL) {
+		talloc_free(r);
+		return false;
+	}
+
+	pull->flags |= LIBNDR_FLAG_REF_ALLOC;
+	ndr_err = call->ndr_pull(pull, NDR_IN, r);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(r);
+		return false;
+	}
+
+	if (DEBUGLEVEL >= 10) {
+		NDR_PRINT_IN_DEBUG(wbint_QuerySequenceNumber, r);
+	}
+
+	ZERO_STRUCT(r->out);
+	r->out.sequence = talloc_zero(r, uint32_t);
+	if (r->out.sequence == NULL) {
+		talloc_free(r);
+		return false;
+	}
+
+	r->out.result = _wbint_QuerySequenceNumber(p, r);
+
+	if (p->rng_fault_state) {
+		talloc_free(r);
+		/* Return true here, srv_pipe_hnd.c will take care */
+		return true;
+	}
+
+	if (DEBUGLEVEL >= 10) {
+		NDR_PRINT_OUT_DEBUG(wbint_QuerySequenceNumber, r);
+	}
+
+	push = ndr_push_init_ctx(r, NULL);
+	if (push == NULL) {
+		talloc_free(r);
+		return false;
+	}
+
+	ndr_err = call->ndr_push(push, NDR_OUT, r);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(r);
+		return false;
+	}
+
+	blob = ndr_push_blob(push);
+	if (!prs_copy_data_in(&p->out_data.rdata, (const char *)blob.data, (uint32_t)blob.length)) {
+		talloc_free(r);
+		return false;
+	}
+
+	talloc_free(r);
+
+	return true;
+}
+
 
 /* Tables */
 static struct api_struct api_wbint_cmds[] =
@@ -838,6 +918,7 @@ static struct api_struct api_wbint_cmds[] =
 	{"WBINT_QUERYUSER", NDR_WBINT_QUERYUSER, api_wbint_QueryUser},
 	{"WBINT_LOOKUPUSERALIASES", NDR_WBINT_LOOKUPUSERALIASES, api_wbint_LookupUserAliases},
 	{"WBINT_LOOKUPUSERGROUPS", NDR_WBINT_LOOKUPUSERGROUPS, api_wbint_LookupUserGroups},
+	{"WBINT_QUERYSEQUENCENUMBER", NDR_WBINT_QUERYSEQUENCENUMBER, api_wbint_QuerySequenceNumber},
 };
 
 void wbint_get_pipe_fns(struct api_struct **fns, int *n_fns)
@@ -989,6 +1070,18 @@ NTSTATUS rpc_wbint_dispatch(struct rpc_pipe_client *cli, TALLOC_CTX *mem_ctx, co
 			return NT_STATUS_OK;
 		}
 
+		case NDR_WBINT_QUERYSEQUENCENUMBER: {
+			struct wbint_QuerySequenceNumber *r = (struct wbint_QuerySequenceNumber *)_r;
+			ZERO_STRUCT(r->out);
+			r->out.sequence = talloc_zero(mem_ctx, uint32_t);
+			if (r->out.sequence == NULL) {
+			return NT_STATUS_NO_MEMORY;
+			}
+
+			r->out.result = _wbint_QuerySequenceNumber(cli->pipes_struct, r);
+			return NT_STATUS_OK;
+		}
+
 		default:
 			return NT_STATUS_NOT_IMPLEMENTED;
 	}
diff --git a/source3/librpc/gen_ndr/srv_wbint.h b/source3/librpc/gen_ndr/srv_wbint.h
index 20ca316375..5749b1e9ae 100644
--- a/source3/librpc/gen_ndr/srv_wbint.h
+++ b/source3/librpc/gen_ndr/srv_wbint.h
@@ -11,6 +11,7 @@ NTSTATUS _wbint_Gid2Sid(pipes_struct *p, struct wbint_Gid2Sid *r);
 NTSTATUS _wbint_QueryUser(pipes_struct *p, struct wbint_QueryUser *r);
 NTSTATUS _wbint_LookupUserAliases(pipes_struct *p, struct wbint_LookupUserAliases *r);
 NTSTATUS _wbint_LookupUserGroups(pipes_struct *p, struct wbint_LookupUserGroups *r);
+NTSTATUS _wbint_QuerySequenceNumber(pipes_struct *p, struct wbint_QuerySequenceNumber *r);
 void wbint_get_pipe_fns(struct api_struct **fns, int *n_fns);
 NTSTATUS rpc_wbint_dispatch(struct rpc_pipe_client *cli, TALLOC_CTX *mem_ctx, const struct ndr_interface_table *table, uint32_t opnum, void *r);
 void _wbint_Ping(pipes_struct *p, struct wbint_Ping *r);
@@ -23,5 +24,6 @@ NTSTATUS _wbint_Gid2Sid(pipes_struct *p, struct wbint_Gid2Sid *r);
 NTSTATUS _wbint_QueryUser(pipes_struct *p, struct wbint_QueryUser *r);
 NTSTATUS _wbint_LookupUserAliases(pipes_struct *p, struct wbint_LookupUserAliases *r);
 NTSTATUS _wbint_LookupUserGroups(pipes_struct *p, struct wbint_LookupUserGroups *r);
+NTSTATUS _wbint_QuerySequenceNumber(pipes_struct *p, struct wbint_QuerySequenceNumber *r);
 NTSTATUS rpc_wbint_init(void);
 #endif /* __SRV_WBINT__ */
diff --git a/source3/librpc/gen_ndr/wbint.h b/source3/librpc/gen_ndr/wbint.h
index 28382ec346..c5caa79a4b 100644
--- a/source3/librpc/gen_ndr/wbint.h
+++ b/source3/librpc/gen_ndr/wbint.h
@@ -166,4 +166,13 @@ struct wbint_LookupUserGroups {
 
 };
 
+
+struct wbint_QuerySequenceNumber {
+	struct {
+		uint32_t *sequence;/* [ref] */
+		NTSTATUS result;
+	} out;
+
+};
+
 #endif /* _HEADER_wbint */
diff --git a/source3/librpc/idl/wbint.idl b/source3/librpc/idl/wbint.idl
index f994126711..a4aab7c1ac 100644
--- a/source3/librpc/idl/wbint.idl
+++ b/source3/librpc/idl/wbint.idl
@@ -88,4 +88,8 @@ interface wbint
 	[in] dom_sid *sid,
 	[out] wbint_SidArray *sids
 	);
+
+    NTSTATUS wbint_QuerySequenceNumber(
+	[out] uint32 *sequence
+	);
 }
\ No newline at end of file
diff --git a/source3/winbindd/wb_seqnum.c b/source3/winbindd/wb_seqnum.c
new file mode 100644
index 0000000000..111150eddd
--- /dev/null
+++ b/source3/winbindd/wb_seqnum.c
@@ -0,0 +1,82 @@
+/*
+   Unix SMB/CIFS implementation.
+   async seqnum
+   Copyright (C) Volker Lendecke 2009
+
+   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 "winbindd.h"
+#include "librpc/gen_ndr/cli_wbint.h"
+
+struct wb_seqnum_state {
+	uint32_t seqnum;
+};
+
+static void wb_seqnum_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_seqnum_send(TALLOC_CTX *mem_ctx,
+				  struct tevent_context *ev,
+				  struct winbindd_domain *domain)
+{
+	struct tevent_req *req, *subreq;
+	struct wb_seqnum_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct wb_seqnum_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	subreq = rpccli_wbint_QuerySequenceNumber_send(
+		state, ev, domain->child.rpccli, &state->seqnum);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_seqnum_done, req);
+	return req;
+}
+
+static void wb_seqnum_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_seqnum_state *state = tevent_req_data(
+		req, struct wb_seqnum_state);
+	NTSTATUS status, result;
+
+	status = rpccli_wbint_QuerySequenceNumber_recv(subreq, state, &result);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+	if (!NT_STATUS_IS_OK(result)) {
+		tevent_req_nterror(req, result);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+NTSTATUS wb_seqnum_recv(struct tevent_req *req, uint32_t *seqnum)
+{
+	struct wb_seqnum_state *state = tevent_req_data(
+		req, struct wb_seqnum_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	*seqnum = state->seqnum;
+	return NT_STATUS_OK;
+}
diff --git a/source3/winbindd/winbindd_dual_srv.c b/source3/winbindd/winbindd_dual_srv.c
index 4771f424b7..92233188de 100644
--- a/source3/winbindd/winbindd_dual_srv.c
+++ b/source3/winbindd/winbindd_dual_srv.c
@@ -145,3 +145,15 @@ NTSTATUS _wbint_LookupUserGroups(pipes_struct *p,
 		domain, p->mem_ctx, r->in.sid,
 		&r->out.sids->num_sids, &r->out.sids->sids);
 }
+
+NTSTATUS _wbint_QuerySequenceNumber(pipes_struct *p,
+				    struct wbint_QuerySequenceNumber *r)
+{
+	struct winbindd_domain *domain = wb_child_domain();
+
+	if (domain == NULL) {
+		return NT_STATUS_REQUEST_NOT_ACCEPTED;
+	}
+
+	return domain->methods->sequence_number(domain, r->out.sequence);
+}
diff --git a/source3/winbindd/winbindd_proto.h b/source3/winbindd/winbindd_proto.h
index c9ef5e14ea..1638b0be62 100644
--- a/source3/winbindd/winbindd_proto.h
+++ b/source3/winbindd/winbindd_proto.h
@@ -767,6 +767,10 @@ struct tevent_req *winbindd_getgroups_send(TALLOC_CTX *mem_ctx,
 NTSTATUS winbindd_getgroups_recv(struct tevent_req *req,
 				 struct winbindd_response *response);
 
+struct tevent_req *wb_seqnum_send(TALLOC_CTX *mem_ctx,
+				  struct tevent_context *ev,
+				  struct winbindd_domain *domain);
+NTSTATUS wb_seqnum_recv(struct tevent_req *req, uint32_t *seqnum);
 
 
 #endif /*  _WINBINDD_PROTO_H_  */