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