Add lease request and release protocol

[src/drm-lease-manager.git] / common / dlm-protocol.c

diff --git a/common/dlm-protocol.c b/common/dlm-protocol.c
new file mode 100644 (file)
index 0000000..4fc87b2
--- /dev/null
+++ b/common/dlm-protocol.c
@@ -0,0 +1,66 @@
+/* Copyright 2020-2021 IGEL Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "dlm-protocol.h"
+
+#include <errno.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+bool receive_dlm_client_request(int socket, struct dlm_client_request *request)
+{
+
+       ssize_t len;
+       struct iovec iov = {
+           .iov_base = request,
+           .iov_len = sizeof(*request),
+       };
+       struct msghdr msg = {
+           .msg_iov = &iov,
+           .msg_iovlen = 1,
+       };
+
+       while ((len = recvmsg(socket, &msg, 0)) < 0) {
+               if (errno != EINTR)
+                       return false;
+       }
+
+       if (len != sizeof(*request)) {
+               errno = EPROTO;
+               return false;
+       }
+       return true;
+}
+
+bool send_dlm_client_request(int socket, struct dlm_client_request *request)
+{
+       struct iovec iov = {
+           .iov_base = request,
+           .iov_len = sizeof(*request),
+       };
+
+       struct msghdr msg = {
+           .msg_iov = &iov,
+           .msg_iovlen = 1,
+       };
+
+       while (sendmsg(socket, &msg, 0) < 1) {
+               if (errno != EINTR)
+                       return false;
+       }
+       return true;
+}