Dynamic payload for relayd create session command

[lttng-tools.git] / src / bin / lttng-relayd / cmd-2-11.c

diff --git a/src/bin/lttng-relayd/cmd-2-11.c b/src/bin/lttng-relayd/cmd-2-11.c
new file mode 100644 (file)
index 0000000..993062b
--- /dev/null
+++ b/src/bin/lttng-relayd/cmd-2-11.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2018 - Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * 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., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _LGPL_SOURCE
+#include <assert.h>
+#include <inttypes.h>
+
+#include <common/common.h>
+#include <common/sessiond-comm/relayd.h>
+
+#include <common/compat/endian.h>
+#include <common/compat/string.h>
+#include <lttng/constant.h>
+
+#include "cmd-2-11.h"
+#include "lttng-relayd.h"
+
+int cmd_create_session_2_11(const struct lttng_buffer_view *payload,
+               char *session_name, char *hostname,
+               uint32_t *live_timer, bool *snapshot)
+{
+       int ret;
+       struct lttcomm_relayd_create_session_2_11 header;
+       size_t header_len, received_names_size;
+       struct lttng_buffer_view session_name_view;
+       struct lttng_buffer_view hostname_view;
+
+       header_len = sizeof(header);
+
+       if (payload->size < header_len) {
+               ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
+                               header_len, payload->size);
+               ret = -1;
+               goto error;
+       }
+       memcpy(&header, payload->data, header_len);
+
+       header.session_name_len = be32toh(header.session_name_len);
+       header.hostname_len = be32toh(header.hostname_len);
+       header.live_timer = be32toh(header.live_timer);
+
+       received_names_size = header.session_name_len + header.hostname_len;
+       if (payload->size < header_len + received_names_size) {
+               ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
+                               header_len + received_names_size, payload->size);
+               ret = -1;
+               goto error;
+       }
+
+       /* Validate length against defined constant. */
+       if (header.session_name_len > LTTNG_NAME_MAX) {
+               ret = -ENAMETOOLONG;
+               ERR("Length of session name (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.session_name_len, LTTNG_NAME_MAX);
+               goto error;
+       }
+       if (header.hostname_len > LTTNG_HOST_NAME_MAX) {
+               ret = -ENAMETOOLONG;
+               ERR("Length of hostname (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.hostname_len, LTTNG_HOST_NAME_MAX);
+               goto error;
+       }
+
+       session_name_view = lttng_buffer_view_from_view(payload, header_len,
+                       header.session_name_len);
+       hostname_view = lttng_buffer_view_from_view(payload,
+                       header_len + header.session_name_len, header.hostname_len);
+
+       /* Validate that names are NULL terminated. */
+       if (session_name_view.data[session_name_view.size - 1] != '\0') {
+               ERR("cmd_create_session_2_11 session_name is invalid (not NULL terminated)");
+               ret = -1;
+               goto error;
+       }
+
+       if (hostname_view.data[hostname_view.size - 1] != '\0') {
+               ERR("cmd_create_session_2_11 hostname is invalid (not NULL terminated)");
+               ret = -1;
+               goto error;
+       }
+
+       /*
+        * Length and null-termination check are already performed.
+        * LTTNG_NAME_MAX and LTTNG_HOST_NAME_MAX max size are expected.
+        */
+       strcpy(session_name, session_name_view.data);
+       strcpy(hostname, hostname_view.data);
+
+       *live_timer = header.live_timer;
+       *snapshot = !!header.snapshot;
+
+       ret = 0;
+
+error:
+       return ret;
+}