src/bin/lttng-relayd/cmd-2-2.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 "cmd-2-2.h"
  14
  15 #include <common/common.h>
  16 #include <common/sessiond-comm/relayd.h>
  17
  18 #include <common/compat/endian.h>
  19 #include <common/compat/string.h>
  20 #include <lttng/constant.h>
  21
  22 #include "cmd-2-1.h"
  23 #include "utils.h"
  24
  25 /*
  26  * cmd_recv_stream_2_2 allocates path_name and channel_name.
  27  */
  28 int cmd_recv_stream_2_2(const struct lttng_buffer_view *payload,
  29                 char **ret_path_name, char **ret_channel_name,
  30                 uint64_t *tracefile_size, uint64_t *tracefile_count)
  31 {
  32         int ret;
  33         struct lttcomm_relayd_add_stream_2_2 stream_info;
  34         char *path_name = NULL;
  35         char *channel_name = NULL;
  36         size_t len;
  37
  38         if (payload->size < sizeof(stream_info)) {
  39                 ERR("Unexpected payload size in \"cmd_recv_stream_2_2\": expected >= %zu bytes, got %zu bytes",
  40                                 sizeof(stream_info), payload->size);
  41                 ret = -1;
  42                 goto error;
  43         }
  44         memcpy(&stream_info, payload->data, sizeof(stream_info));
  45
  46         len = lttng_strnlen(stream_info.pathname, sizeof(stream_info.pathname));
  47         /* Ensure that NULL-terminated and fits in local filename length. */
  48         if (len == sizeof(stream_info.pathname) || len >= LTTNG_NAME_MAX) {
  49                 ret = -ENAMETOOLONG;
  50                 ERR("Path name too long");
  51                 goto error;
  52         }
  53         path_name = strdup(stream_info.pathname);
  54         if (!path_name) {
  55                 PERROR("Path name allocation");
  56                 ret = -ENOMEM;
  57                 goto error;
  58         }
  59         len = lttng_strnlen(stream_info.channel_name, sizeof(stream_info.channel_name));
  60         if (len == sizeof(stream_info.channel_name) || len >= DEFAULT_STREAM_NAME_LEN) {
  61                 ret = -ENAMETOOLONG;
  62                 ERR("Channel name too long");
  63                 goto error;
  64         }
  65         channel_name = strdup(stream_info.channel_name);
  66         if (!channel_name) {
  67                 ret = -errno;
  68                 PERROR("Channel name allocation");
  69                 goto error;
  70         }
  71
  72         *tracefile_size = be64toh(stream_info.tracefile_size);
  73         *tracefile_count = be64toh(stream_info.tracefile_count);
  74         *ret_path_name = path_name;
  75         *ret_channel_name = channel_name;
  76         return 0;
  77 error:
  78         free(path_name);
  79         free(channel_name);
  80         return ret;
  81 }