src/bin/lttng-relayd/cmd-2-11.c

   1 /*
   2  * Copyright (C) 2018 - Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <inttypes.h>
  21
  22 #include <common/common.h>
  23 #include <common/sessiond-comm/relayd.h>
  24
  25 #include <common/compat/endian.h>
  26 #include <common/compat/string.h>
  27 #include <lttng/constant.h>
  28
  29 #include "cmd-2-11.h"
  30 #include "lttng-relayd.h"
  31
  32 int cmd_create_session_2_11(const struct lttng_buffer_view *payload,
  33                 char *session_name, char *hostname,
  34                 uint32_t *live_timer, bool *snapshot)
  35 {
  36         int ret;
  37         struct lttcomm_relayd_create_session_2_11 header;
  38         size_t header_len, received_names_size;
  39         struct lttng_buffer_view session_name_view;
  40         struct lttng_buffer_view hostname_view;
  41
  42         header_len = sizeof(header);
  43
  44         if (payload->size < header_len) {
  45                 ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
  46                                 header_len, payload->size);
  47                 ret = -1;
  48                 goto error;
  49         }
  50         memcpy(&header, payload->data, header_len);
  51
  52         header.session_name_len = be32toh(header.session_name_len);
  53         header.hostname_len = be32toh(header.hostname_len);
  54         header.live_timer = be32toh(header.live_timer);
  55
  56         received_names_size = header.session_name_len + header.hostname_len;
  57         if (payload->size < header_len + received_names_size) {
  58                 ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
  59                                 header_len + received_names_size, payload->size);
  60                 ret = -1;
  61                 goto error;
  62         }
  63
  64         /* Validate length against defined constant. */
  65         if (header.session_name_len > LTTNG_NAME_MAX) {
  66                 ret = -ENAMETOOLONG;
  67                 ERR("Length of session name (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.session_name_len, LTTNG_NAME_MAX);
  68                 goto error;
  69         }
  70         if (header.hostname_len > LTTNG_HOST_NAME_MAX) {
  71                 ret = -ENAMETOOLONG;
  72                 ERR("Length of hostname (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.hostname_len, LTTNG_HOST_NAME_MAX);
  73                 goto error;
  74         }
  75
  76         session_name_view = lttng_buffer_view_from_view(payload, header_len,
  77                         header.session_name_len);
  78         hostname_view = lttng_buffer_view_from_view(payload,
  79                         header_len + header.session_name_len, header.hostname_len);
  80
  81         /* Validate that names are NULL terminated. */
  82         if (session_name_view.data[session_name_view.size - 1] != '\0') {
  83                 ERR("cmd_create_session_2_11 session_name is invalid (not NULL terminated)");
  84                 ret = -1;
  85                 goto error;
  86         }
  87
  88         if (hostname_view.data[hostname_view.size - 1] != '\0') {
  89                 ERR("cmd_create_session_2_11 hostname is invalid (not NULL terminated)");
  90                 ret = -1;
  91                 goto error;
  92         }
  93
  94         /*
  95          * Length and null-termination check are already performed.
  96          * LTTNG_NAME_MAX and LTTNG_HOST_NAME_MAX max size are expected.
  97          */
  98         strcpy(session_name, session_name_view.data);
  99         strcpy(hostname, hostname_view.data);
 100
 101         *live_timer = header.live_timer;
 102         *snapshot = !!header.snapshot;
 103
 104         ret = 0;
 105
 106 error:
 107         return ret;
 108 }