src/bin/lttng-relayd/cmd-2-1.c

   1 /*
   2  * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
   3  * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
   4  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-only
   7  *
   8  */
   9
  10 #define _LGPL_SOURCE
  11 #include <assert.h>
  12
  13 #include <common/common.h>
  14 #include <common/sessiond-comm/relayd.h>
  15 #include <common/compat/string.h>
  16 #include <lttng/constant.h>
  17
  18 #include "cmd-2-1.h"
  19 #include "utils.h"
  20
  21 /*
  22  * cmd_recv_stream_2_1 allocates path_name and channel_name.
  23  */
  24 int cmd_recv_stream_2_1(const struct lttng_buffer_view *payload,
  25                 char **ret_path_name, char **ret_channel_name)
  26 {
  27         int ret;
  28         struct lttcomm_relayd_add_stream stream_info;
  29         char *path_name = NULL;
  30         char *channel_name = NULL;
  31         size_t len;
  32
  33         if (payload->size < sizeof(stream_info)) {
  34                 ERR("Unexpected payload size in \"cmd_recv_stream_2_1\": expected >= %zu bytes, got %zu bytes",
  35                                 sizeof(stream_info), payload->size);
  36                 ret = -1;
  37                 goto error;
  38         }
  39         memcpy(&stream_info, payload->data, sizeof(stream_info));
  40
  41         len = lttng_strnlen(stream_info.pathname, sizeof(stream_info.pathname));
  42         /* Ensure that NULL-terminated and fits in local filename length. */
  43         if (len == sizeof(stream_info.pathname) || len >= LTTNG_NAME_MAX) {
  44                 ret = -ENAMETOOLONG;
  45                 ERR("Path name too long");
  46                 goto error;
  47         }
  48         path_name = strdup(stream_info.pathname);
  49         if (!path_name) {
  50                 PERROR("Path name allocation");
  51                 ret = -ENOMEM;
  52                 goto error;
  53         }
  54         len = lttng_strnlen(stream_info.channel_name, sizeof(stream_info.channel_name));
  55         if (len == sizeof(stream_info.channel_name) || len >= DEFAULT_STREAM_NAME_LEN) {
  56                 ret = -ENAMETOOLONG;
  57                 ERR("Channel name too long");
  58                 goto error;
  59         }
  60         channel_name = strdup(stream_info.channel_name);
  61         if (!channel_name) {
  62                 ret = -errno;
  63                 PERROR("Channel name allocation");
  64                 goto error;
  65         }
  66
  67         *ret_path_name = path_name;
  68         *ret_channel_name = channel_name;
  69         return 0;
  70 error:
  71         free(path_name);
  72         free(channel_name);
  73         return ret;
  74 }