2 files changed, 98 insertions, 0 deletions

diff --git a/nsswitch/libwbclient/wbc_async.h b/nsswitch/libwbclient/wbc_async.h
index f3eab91633..e215fdd8e8 100644
--- a/nsswitch/libwbclient/wbc_async.h
+++ b/nsswitch/libwbclient/wbc_async.h
@@ -99,5 +99,11 @@ struct tevent_req *wbcPing_send(TALLOC_CTX *mem_ctx,
 			       struct wb_context *wb_ctx);
 wbcErr wbcPing_recv(struct tevent_req *req);
 
+struct tevent_req *wbcInterfaceVersion_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct wb_context *wb_ctx);
+wbcErr wbcInterfaceVersion_recv(struct tevent_req *req,
+			        uint32_t *interface_version);
+
 
 #endif /*_WBC_ASYNC_H_*/
diff --git a/nsswitch/libwbclient/wbc_util.c b/nsswitch/libwbclient/wbc_util.c
index ddef8b644d..f72f4fc749 100644
--- a/nsswitch/libwbclient/wbc_util.c
+++ b/nsswitch/libwbclient/wbc_util.c
@@ -123,6 +123,98 @@ wbcErr wbcPing(void)
 	return wbcRequestResponse(WINBINDD_PING, &request, &response);
 }
 
+struct wbc_interface_version_state {
+	struct winbindd_request req;
+	uint32_t version;
+};
+
+static void wbcInterfaceVersion_done(struct tevent_req *subreq);
+
+/**
+ * @brief Request the interface version from winbind
+ *
+ * @param mem_ctx	talloc context to allocate memory from
+ * @param ev		tevent context to use for async requests
+ * @param wb_ctx	winbind context
+ *
+ * @return tevevt_req on success, NULL on failure
+ */
+
+struct tevent_req *wbcInterfaceVersion_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct wb_context *wb_ctx)
+{
+	struct tevent_req *req, *subreq;
+	struct wbc_interface_version_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct wbc_interface_version_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	ZERO_STRUCT(state->req);
+	state->req.cmd = WINBINDD_INTERFACE_VERSION;
+
+	subreq = wb_trans_send(state, ev, wb_ctx, false, &state->req);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	tevent_req_set_callback(subreq, wbcInterfaceVersion_done, req);
+
+	return req;
+}
+
+static void wbcInterfaceVersion_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+			subreq, struct tevent_req);
+	struct wbc_interface_version_state *state = tevent_req_data(
+			req, struct wbc_interface_version_state);
+	struct winbindd_response *resp;
+	wbcErr wbc_status;
+
+	wbc_status = wb_trans_recv(subreq, state, &resp);
+	TALLOC_FREE(subreq);
+	if (!WBC_ERROR_IS_OK(wbc_status)) {
+		tevent_req_error(req, wbc_status);
+		return;
+	}
+	state->version = resp->data.interface_version;
+	TALLOC_FREE(resp);
+
+	tevent_req_done(req);
+}
+
+/**
+ * @brief Receive the winbind interface version
+ *
+ * @param req			tevent_req containing the request
+ * @param interface_version	pointer to uint32_t to hold the interface
+ * 				version
+ *
+ * @return #wbcErr
+ */
+
+wbcErr wbcInterfaceVersion_recv(struct tevent_req *req,
+			        uint32_t *interface_version)
+{
+	struct wbc_interface_version_state *state = tevent_req_data(
+			req, struct wbc_interface_version_state);
+	wbcErr wbc_status;
+
+	if (tevent_req_is_wbcerr(req, &wbc_status)) {
+		tevent_req_received(req);
+		return wbc_status;
+	}
+
+	*interface_version = state->version;
+
+	tevent_req_received(req);
+	return WBC_ERR_SUCCESS;
+}
+
+
 wbcErr wbcInterfaceDetails(struct wbcInterfaceDetails **_details)
 {
 	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;