src/bin/lttng-relayd/cmd-2-4.c

   1 /*
   2  * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      David Goulet <dgoulet@efficios.com>
   4  *               2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License, version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc., 51
  17  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #define _LGPL_SOURCE
  21 #include <assert.h>
  22
  23 #include <common/common.h>
  24 #include <common/sessiond-comm/relayd.h>
  25
  26 #include <common/compat/endian.h>
  27 #include <common/compat/string.h>
  28 #include <lttng/constant.h>
  29
  30 #include "cmd-2-4.h"
  31 #include "lttng-relayd.h"
  32
  33 int cmd_create_session_2_4(const struct lttng_buffer_view *payload,
  34                 char *session_name, char *hostname,
  35                 uint32_t *live_timer, bool *snapshot)
  36 {
  37         int ret;
  38         struct lttcomm_relayd_create_session_2_4 session_info;
  39         size_t len;
  40
  41         if (payload->size < sizeof(session_info)) {
  42                 ERR("Unexpected payload size in \"cmd_create_session_2_4\": expected >= %zu bytes, got %zu bytes",
  43                                 sizeof(session_info), payload->size);
  44                 ret = -1;
  45                 goto error;
  46         }
  47         memcpy(&session_info, payload->data, sizeof(session_info));
  48
  49         len = lttng_strnlen(session_info.session_name, sizeof(session_info.session_name));
  50         /* Ensure that NULL-terminated and fits in local filename length. */
  51         if (len == sizeof(session_info.session_name) || len >= LTTNG_NAME_MAX) {
  52                 ret = -ENAMETOOLONG;
  53                 ERR("Session name too long");
  54                 goto error;
  55         } else if (len == 0) {
  56                 ret = -EINVAL;
  57                 ERR("Session name can't be of length 0");
  58                 goto error;
  59         }
  60         strncpy(session_name, session_info.session_name, LTTNG_NAME_MAX);
  61
  62         len = lttng_strnlen(session_info.hostname, sizeof(session_info.hostname));
  63         if (len == sizeof(session_info.hostname) || len >= LTTNG_HOST_NAME_MAX) {
  64                 ret = -ENAMETOOLONG;
  65                 ERR("Session name too long");
  66                 goto error;
  67         }
  68         strncpy(hostname, session_info.hostname, LTTNG_HOST_NAME_MAX);
  69
  70         *live_timer = be32toh(session_info.live_timer);
  71         *snapshot = be32toh(session_info.snapshot);
  72
  73         ret = 0;
  74
  75 error:
  76         return ret;
  77 }